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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `ROOT_PLAYER_DIR` struct in crate `abstio`."><meta name="keywords" content="rust, rustlang, rust-lang, ROOT_PLAYER_DIR"><title>ROOT_PLAYER_DIR in abstio::abst_paths - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location"><a href="#">ROOT_PLAYER_DIR</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#fields">Fields</a></h3><ul><li><a href="#structfield.__private_field">__private_field</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#deref-methods-String">Methods from Deref&lt;Target=String&gt;</a></h3><ul><li><a href="#method.as_bytes">as_bytes</a></li><li><a href="#method.as_str">as_str</a></li><li><a href="#method.capacity">capacity</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.len">len</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#deref-methods-str">Methods from Deref&lt;Target=str&gt;</a></h3><ul><li><a href="#method.as_bytes">as_bytes</a></li><li><a href="#method.as_ptr">as_ptr</a></li><li><a href="#method.bytes">bytes</a></li><li><a href="#method.ceil_char_boundary">ceil_char_boundary</a></li><li><a href="#method.char_indices">char_indices</a></li><li><a href="#method.chars">chars</a></li><li><a href="#method.contains">contains</a></li><li><a href="#method.encode_utf16">encode_utf16</a></li><li><a href="#method.ends_with">ends_with</a></li><li><a href="#method.eq_ignore_ascii_case">eq_ignore_ascii_case</a></li><li><a href="#method.escape_debug">escape_debug</a></li><li><a href="#method.escape_default">escape_default</a></li><li><a href="#method.escape_unicode">escape_unicode</a></li><li><a href="#method.find">find</a></li><li><a href="#method.floor_char_boundary">floor_char_boundary</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_unchecked">get_unchecked</a></li><li><a href="#method.is_ascii">is_ascii</a></li><li><a href="#method.is_char_boundary">is_char_boundary</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.len">len</a></li><li><a href="#method.lines">lines</a></li><li><a href="#method.lines_any">lines_any</a></li><li><a href="#method.match_indices">match_indices</a></li><li><a href="#method.matches">matches</a></li><li><a href="#method.parse">parse</a></li><li><a href="#method.repeat">repeat</a></li><li><a href="#method.replace">replace</a></li><li><a href="#method.replacen">replacen</a></li><li><a href="#method.rfind">rfind</a></li><li><a href="#method.rmatch_indices">rmatch_indices</a></li><li><a href="#method.rmatches">rmatches</a></li><li><a href="#method.rsplit">rsplit</a></li><li><a href="#method.rsplit_once">rsplit_once</a></li><li><a href="#method.rsplit_terminator">rsplit_terminator</a></li><li><a href="#method.rsplitn">rsplitn</a></li><li><a href="#method.slice_unchecked">slice_unchecked</a></li><li><a href="#method.split">split</a></li><li><a href="#method.split_ascii_whitespace">split_ascii_whitespace</a></li><li><a href="#method.split_at">split_at</a></li><li><a href="#method.split_inclusive">split_inclusive</a></li><li><a href="#method.split_once">split_once</a></li><li><a href="#method.split_terminator">split_terminator</a></li><li><a href="#method.split_whitespace">split_whitespace</a></li><li><a href="#method.splitn">splitn</a></li><li><a href="#method.starts_with">starts_with</a></li><li><a href="#method.strip_prefix">strip_prefix</a></li><li><a href="#method.strip_suffix">strip_suffix</a></li><li><a href="#method.to_ascii_lowercase">to_ascii_lowercase</a></li><li><a href="#method.to_ascii_uppercase">to_ascii_uppercase</a></li><li><a href="#method.to_lowercase">to_lowercase</a></li><li><a href="#method.to_uppercase">to_uppercase</a></li><li><a href="#method.trim">trim</a></li><li><a href="#method.trim_end">trim_end</a></li><li><a href="#method.trim_end_matches">trim_end_matches</a></li><li><a href="#method.trim_left">trim_left</a></li><li><a href="#method.trim_left_matches">trim_left_matches</a></li><li><a href="#method.trim_matches">trim_matches</a></li><li><a href="#method.trim_right">trim_right</a></li><li><a href="#method.trim_right_matches">trim_right_matches</a></li><li><a href="#method.trim_start">trim_start</a></li><li><a href="#method.trim_start_matches">trim_start_matches</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#trait-implementations">Trait Implementations</a></h3><ul><li><a href="#impl-Deref">Deref</a></li><li><a href="#impl-LazyStatic">LazyStatic</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul><li><a href="#impl-RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-Send">Send</a></li><li><a href="#impl-Sync">Sync</a></li><li><a href="#impl-Unpin">Unpin</a></li><li><a href="#impl-UnwindSafe">UnwindSafe</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#blanket-implementations">Blanket Implementations</a></h3><ul><li><a href="#impl-Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E">Borrow&lt;T&gt;</a></li><li><a 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<h1 class="fqn"><span class="in-band">Struct <a href="../index.html">abstio</a>::<wbr><a href="index.html">abst_paths</a>::<wbr><a class="struct" href="#">ROOT_PLAYER_DIR</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/abstio/abst_paths.rs.html#14-57">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust struct"><code>struct ROOT_PLAYER_DIR {
__private_field: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.unit.html">()</a>,
}</code></pre></div><h2 id="fields" class="fields small-section-header">Fields<a href="#fields" class="anchor"></a></h2><span id="structfield.__private_field" class="structfield small-section-header"><a href="#structfield.__private_field" class="anchor field"></a><code>__private_field: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.unit.html">()</a></code></span><h2 id="deref-methods-String" class="small-section-header"><span>Methods from <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>&lt;Target = <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;</span><a href="#deref-methods-String" class="anchor"></a></h2><div id="deref-methods-String-1"><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_str" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.7.0">1.7.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/string.rs.html#808">source</a></span><a href="#method.as_str" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.as_str" class="fnname">as_str</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Extracts a string slice containing the entire <code>String</code>.</p>
<h5 id="examples"><a href="#examples">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String::from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;foo&quot;</span>, <span class="ident">s</span>.<span class="ident">as_str</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.capacity" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/string.rs.html#903">source</a></span><a href="#method.capacity" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.capacity" class="fnname">capacity</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns this <code>String</code>’s capacity, in bytes.</p>
<h5 id="examples-1"><a href="#examples-1">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String::with_capacity</span>(<span class="number">10</span>);
<span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="number">10</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_bytes" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/string.rs.html#1171">source</a></span><a href="#method.as_bytes" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.as_bytes" class="fnname">as_bytes</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;[</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span><code class="content"><span class="where fmt-newline">impl&lt;'_&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span><span class="where fmt-newline">impl&lt;'_&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ mut [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Returns a byte slice of this <code>String</code>’s contents.</p>
<p>The inverse of this method is <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html#method.from_utf8"><code>from_utf8</code></a>.</p>
<h5 id="examples-2"><a href="#examples-2">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String::from</span>(<span class="string">&quot;hello&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="number">104</span>, <span class="number">101</span>, <span class="number">108</span>, <span class="number">108</span>, <span class="number">111</span>], <span class="ident">s</span>.<span class="ident">as_bytes</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.len" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/string.rs.html#1550">source</a></span><a href="#method.len" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.len" class="fnname">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the length of this <code>String</code>, in bytes, not <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html" title="char"><code>char</code></a>s or
graphemes. In other words, it might not be what a human considers the
length of the string.</p>
<h5 id="examples-3"><a href="#examples-3">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">String::from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">fancy_f</span> <span class="op">=</span> <span class="ident">String::from</span>(<span class="string">&quot;ƒoo&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="ident">fancy_f</span>.<span class="ident">len</span>(), <span class="number">4</span>);
<span class="macro">assert_eq!</span>(<span class="ident">fancy_f</span>.<span class="ident">chars</span>().<span class="ident">count</span>(), <span class="number">3</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_empty" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/string.rs.html#1570">source</a></span><a href="#method.is_empty" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fnname">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if this <code>String</code> has a length of zero, and <code>false</code> otherwise.</p>
<h5 id="examples-4"><a href="#examples-4">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String::new</span>();
<span class="macro">assert!</span>(<span class="ident">v</span>.<span class="ident">is_empty</span>());
<span class="ident">v</span>.<span class="ident">push</span>(<span class="string">&#39;a&#39;</span>);
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">v</span>.<span class="ident">is_empty</span>());</code></pre></div>
</div></details></div></div><h2 id="deref-methods-str" class="small-section-header"><span>Methods from <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>&lt;Target = <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt;</span><a href="#deref-methods-str" class="anchor"></a></h2><div id="deref-methods-str-1"><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.len-1" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#158">source</a></span><a href="#method.len-1" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.len-1" class="fnname">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the length of <code>self</code>.</p>
<p>This length is in bytes, not <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s or graphemes. In other words,
it might not be what a human considers the length of the string.</p>
<h5 id="examples-5"><a href="#examples-5">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="string">&quot;foo&quot;</span>.<span class="ident">len</span>();
<span class="macro">assert_eq!</span>(<span class="number">3</span>, <span class="ident">len</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;ƒoo&quot;</span>.<span class="ident">len</span>(), <span class="number">4</span>); <span class="comment">// fancy f!</span>
<span class="macro">assert_eq!</span>(<span class="string">&quot;ƒoo&quot;</span>.<span class="ident">chars</span>().<span class="ident">count</span>(), <span class="number">3</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_empty-1" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#179">source</a></span><a href="#method.is_empty-1" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.is_empty-1" class="fnname">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if <code>self</code> has a length of zero bytes.</p>
<h5 id="examples-6"><a href="#examples-6">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;not empty&quot;</span>;
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_empty</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_char_boundary" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.9.0">1.9.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#210">source</a></span><a href="#method.is_char_boundary" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.is_char_boundary" class="fnname">is_char_boundary</a>(&amp;self, index: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Checks that <code>index</code>-th byte is the first byte in a UTF-8 code point
sequence or the end of the string.</p>
<p>The start and end of the string (when <code>index == self.len()</code>) are
considered to be boundaries.</p>
<p>Returns <code>false</code> if <code>index</code> is greater than <code>self.len()</code>.</p>
<h5 id="examples-7"><a href="#examples-7">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">0</span>));
<span class="comment">// start of `老`</span>
<span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">6</span>));
<span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="ident">s</span>.<span class="ident">len</span>()));
<span class="comment">// second byte of `ö`</span>
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">2</span>));
<span class="comment">// third byte of `老`</span>
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">8</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.floor_char_boundary" class="method has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#257">source</a></span><a href="#method.floor_char_boundary" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.floor_char_boundary" class="fnname">floor_char_boundary</a>(&amp;self, index: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a></h4></section><div class="item-info"><div class="stab unstable"><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>round_char_boundary</code>)</div></div></summary><div class="docblock"><p>Finds the closest <code>x</code> not exceeding <code>index</code> where <code>is_char_boundary(x)</code> is <code>true</code>.</p>
<p>This method can help you truncate a string so that it’s still valid UTF-8, but doesn’t
exceed a given number of bytes. Note that this is done purely at the character level
and can still visually split graphemes, even though the underlying characters aren’t
split. For example, the emoji 🧑‍🔬 (scientist) could be split so that the string only
includes 🧑 (person) instead.</p>
<h5 id="examples-8"><a href="#examples-8">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attribute">#![<span class="ident">feature</span>(<span class="ident">round_char_boundary</span>)]</span>
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;❤️🧡💛💚💙💜&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">len</span>(), <span class="number">26</span>);
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">13</span>));
<span class="kw">let</span> <span class="ident">closest</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">floor_char_boundary</span>(<span class="number">13</span>);
<span class="macro">assert_eq!</span>(<span class="ident">closest</span>, <span class="number">10</span>);
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..<span class="ident">closest</span>], <span class="string">&quot;❤️🧡&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.ceil_char_boundary" class="method has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#296">source</a></span><a href="#method.ceil_char_boundary" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.ceil_char_boundary" class="fnname">ceil_char_boundary</a>(&amp;self, index: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a></h4></section><div class="item-info"><div class="stab unstable"><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>round_char_boundary</code>)</div></div></summary><div class="docblock"><p>Finds the closest <code>x</code> not below <code>index</code> where <code>is_char_boundary(x)</code> is <code>true</code>.</p>
<p>This method is the natural complement to <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.floor_char_boundary"><code>floor_char_boundary</code></a>. See that method
for more details.</p>
<h5 id="panics"><a href="#panics">Panics</a></h5>
<p>Panics if <code>index &gt; self.len()</code>.</p>
<h5 id="examples-9"><a href="#examples-9">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attribute">#![<span class="ident">feature</span>(<span class="ident">round_char_boundary</span>)]</span>
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;❤️🧡💛💚💙💜&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">len</span>(), <span class="number">26</span>);
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">13</span>));
<span class="kw">let</span> <span class="ident">closest</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">ceil_char_boundary</span>(<span class="number">13</span>);
<span class="macro">assert_eq!</span>(<span class="ident">closest</span>, <span class="number">14</span>);
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..<span class="ident">closest</span>], <span class="string">&quot;❤️🧡💛&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_bytes-1" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#324">source</a></span><a href="#method.as_bytes-1" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.as_bytes-1" class="fnname">as_bytes</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;[</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span><code class="content"><span class="where fmt-newline">impl&lt;'_&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span><span class="where fmt-newline">impl&lt;'_&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">&amp;'_ mut [</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.slice.html">]</a></span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Converts a string slice to a byte slice. To convert the byte slice back
into a string slice, use the <a href="https://doc.rust-lang.org/1.61.0/core/str/converts/fn.from_utf8.html" title="from_utf8"><code>from_utf8</code></a> function.</p>
<h5 id="examples-10"><a href="#examples-10">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="string">&quot;bors&quot;</span>.<span class="ident">as_bytes</span>();
<span class="macro">assert_eq!</span>(<span class="string">b&quot;bors&quot;</span>, <span class="ident">bytes</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_ptr" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#399">source</a></span><a href="#method.as_ptr" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.as_ptr" class="fnname">as_ptr</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html">u8</a></h4></section></summary><div class="docblock"><p>Converts a string slice to a raw pointer.</p>
<p>As string slices are a slice of bytes, the raw pointer points to a
<a href="https://doc.rust-lang.org/1.61.0/std/primitive.u8.html" title="u8"><code>u8</code></a>. This pointer will be pointing to the first byte of the string
slice.</p>
<p>The caller must ensure that the returned pointer is never written to.
If you need to mutate the contents of the string slice, use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.as_mut_ptr"><code>as_mut_ptr</code></a>.</p>
<h5 id="examples-11"><a href="#examples-11">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Hello&quot;</span>;
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_ptr</span>();</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.20.0">1.20.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#440">source</a></span><a href="#method.get" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.get" class="fnname">get</a>&lt;I&gt;(&amp;self, i: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;&lt;I as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a subslice of <code>str</code>.</p>
<p>This is the non-panicking alternative to indexing the <code>str</code>. Returns
<a href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a> whenever equivalent indexing operation would panic.</p>
<h5 id="examples-12"><a href="#examples-12">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String::from</span>(<span class="string">&quot;🗻∈🌏&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;🗻&quot;</span>), <span class="ident">v</span>.<span class="ident">get</span>(<span class="number">0</span>..<span class="number">4</span>));
<span class="comment">// indices not on UTF-8 sequence boundaries</span>
<span class="macro">assert!</span>(<span class="ident">v</span>.<span class="ident">get</span>(<span class="number">1</span>..).<span class="ident">is_none</span>());
<span class="macro">assert!</span>(<span class="ident">v</span>.<span class="ident">get</span>(..<span class="number">8</span>).<span class="ident">is_none</span>());
<span class="comment">// out of bounds</span>
<span class="macro">assert!</span>(<span class="ident">v</span>.<span class="ident">get</span>(..<span class="number">42</span>).<span class="ident">is_none</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_unchecked" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.20.0">1.20.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#506">source</a></span><a href="#method.get_unchecked" class="anchor"></a><h4 class="code-header">pub unsafe fn <a href="#method.get_unchecked" class="fnname">get_unchecked</a>&lt;I&gt;(&amp;self, i: I) -&gt; &amp;&lt;I as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns an unchecked subslice of <code>str</code>.</p>
<p>This is the unchecked alternative to indexing the <code>str</code>.</p>
<h5 id="safety"><a href="#safety">Safety</a></h5>
<p>Callers of this function are responsible that these preconditions are
satisfied:</p>
<ul>
<li>The starting index must not exceed the ending index;</li>
<li>Indexes must be within bounds of the original slice;</li>
<li>Indexes must lie on UTF-8 sequence boundaries.</li>
</ul>
<p>Failing that, the returned string slice may reference invalid memory or
violate the invariants communicated by the <code>str</code> type.</p>
<h5 id="examples-13"><a href="#examples-13">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="string">&quot;🗻∈🌏&quot;</span>;
<span class="kw">unsafe</span> {
<span class="macro">assert_eq!</span>(<span class="string">&quot;🗻&quot;</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">0</span>..<span class="number">4</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;∈&quot;</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">4</span>..<span class="number">7</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;🌏&quot;</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">7</span>..<span class="number">11</span>));
}</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.slice_unchecked" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#598">source</a></span><a href="#method.slice_unchecked" class="anchor"></a><h4 class="code-header">pub unsafe fn <a href="#method.slice_unchecked" class="fnname">slice_unchecked</a>(&amp;self, begin: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>, end: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.29.0: <p>use <code>get_unchecked(begin..end)</code> instead</p>
</div></div></summary><div class="docblock"><p>Creates a string slice from another string slice, bypassing safety
checks.</p>
<p>This is generally not recommended, use with caution! For a safe
alternative see <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html" title="str"><code>str</code></a> and <a href="https://doc.rust-lang.org/1.61.0/core/ops/index/trait.Index.html"><code>Index</code></a>.</p>
<p>This new slice goes from <code>begin</code> to <code>end</code>, including <code>begin</code> but
excluding <code>end</code>.</p>
<p>To get a mutable string slice instead, see the
<a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.slice_mut_unchecked"><code>slice_mut_unchecked</code></a> method.</p>
<h5 id="safety-1"><a href="#safety-1">Safety</a></h5>
<p>Callers of this function are responsible that three preconditions are
satisfied:</p>
<ul>
<li><code>begin</code> must not exceed <code>end</code>.</li>
<li><code>begin</code> and <code>end</code> must be byte positions within the string slice.</li>
<li><code>begin</code> and <code>end</code> must lie on UTF-8 sequence boundaries.</li>
</ul>
<h5 id="examples-14"><a href="#examples-14">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="kw">unsafe</span> {
<span class="macro">assert_eq!</span>(<span class="string">&quot;Löwe 老虎 Léopard&quot;</span>, <span class="ident">s</span>.<span class="ident">slice_unchecked</span>(<span class="number">0</span>, <span class="number">21</span>));
}
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Hello, world!&quot;</span>;
<span class="kw">unsafe</span> {
<span class="macro">assert_eq!</span>(<span class="string">&quot;world&quot;</span>, <span class="ident">s</span>.<span class="ident">slice_unchecked</span>(<span class="number">7</span>, <span class="number">12</span>));
}</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_at" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.4.0">1.4.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#671">source</a></span><a href="#method.split_at" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_at" class="fnname">split_at</a>(&amp;self, mid: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">(</a>&amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">)</a></h4></section></summary><div class="docblock"><p>Divide one string slice into two at an index.</p>
<p>The argument, <code>mid</code>, should be a byte offset from the start of the
string. It must also be on the boundary of a UTF-8 code point.</p>
<p>The two slices returned go from the start of the string slice to <code>mid</code>,
and from <code>mid</code> to the end of the string slice.</p>
<p>To get mutable string slices instead, see the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split_at_mut"><code>split_at_mut</code></a>
method.</p>
<h5 id="panics-1"><a href="#panics-1">Panics</a></h5>
<p>Panics if <code>mid</code> is not on a UTF-8 code point boundary, or if it is
past the end of the last code point of the string slice.</p>
<h5 id="examples-15"><a href="#examples-15">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Per Martin-Löf&quot;</span>;
<span class="kw">let</span> (<span class="ident">first</span>, <span class="ident">last</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split_at</span>(<span class="number">3</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;Per&quot;</span>, <span class="ident">first</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot; Martin-Löf&quot;</span>, <span class="ident">last</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.chars" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#781">source</a></span><a href="#method.chars" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.chars" class="fnname">chars</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.Chars.html" title="struct core::str::iter::Chars">Chars</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s of a string slice.</p>
<p>As a string slice consists of valid UTF-8, we can iterate through a
string slice by <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>. This method returns such an iterator.</p>
<p>It’s important to remember that <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a> represents a Unicode Scalar
Value, and might not match your idea of what a ‘character’ is. Iteration
over grapheme clusters may be what you actually want. This functionality
is not provided by Rust’s standard library, check crates.io instead.</p>
<h5 id="examples-16"><a href="#examples-16">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">word</span> <span class="op">=</span> <span class="string">&quot;goodbye&quot;</span>;
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">chars</span>().<span class="ident">count</span>();
<span class="macro">assert_eq!</span>(<span class="number">7</span>, <span class="ident">count</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">chars</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;g&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;o&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;o&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;d&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;y&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;e&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">chars</span>.<span class="ident">next</span>());</code></pre></div>
<p>Remember, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s might not match your intuition about characters:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="string">&quot;y̆&quot;</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">chars</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;y&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>()); <span class="comment">// not &#39;y̆&#39;</span>
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;\u{0306}&#39;</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">chars</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.char_indices" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#838">source</a></span><a href="#method.char_indices" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.char_indices" class="fnname">char_indices</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.CharIndices.html" title="struct core::str::iter::CharIndices">CharIndices</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s of a string slice, and their
positions.</p>
<p>As a string slice consists of valid UTF-8, we can iterate through a
string slice by <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>. This method returns an iterator of both
these <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, as well as their byte positions.</p>
<p>The iterator yields tuples. The position is first, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a> is
second.</p>
<h5 id="examples-17"><a href="#examples-17">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">word</span> <span class="op">=</span> <span class="string">&quot;goodbye&quot;</span>;
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">char_indices</span>().<span class="ident">count</span>();
<span class="macro">assert_eq!</span>(<span class="number">7</span>, <span class="ident">count</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">char_indices</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">char_indices</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="string">&#39;g&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="string">&#39;o&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="string">&#39;o&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="string">&#39;d&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="string">&#39;b&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="string">&#39;y&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="string">&#39;e&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">char_indices</span>.<span class="ident">next</span>());</code></pre></div>
<p>Remember, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s might not match your intuition about characters:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">yes</span> <span class="op">=</span> <span class="string">&quot;y̆es&quot;</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">char_indices</span> <span class="op">=</span> <span class="ident">yes</span>.<span class="ident">char_indices</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="string">&#39;y&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>()); <span class="comment">// not (0, &#39;y̆&#39;)</span>
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="string">&#39;\u{0306}&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="comment">// note the 3 here - the last character took up two bytes</span>
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="string">&#39;e&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="string">&#39;s&#39;</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">char_indices</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.bytes" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#863">source</a></span><a href="#method.bytes" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.bytes" class="fnname">bytes</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.Bytes.html" title="struct core::str::iter::Bytes">Bytes</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>An iterator over the bytes of a string slice.</p>
<p>As a string slice consists of a sequence of bytes, we can iterate
through a string slice by byte. This method returns such an iterator.</p>
<h5 id="examples-18"><a href="#examples-18">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="string">&quot;bors&quot;</span>.<span class="ident">bytes</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">b&#39;b&#39;</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">b&#39;o&#39;</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">b&#39;r&#39;</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">b&#39;s&#39;</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">bytes</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_whitespace" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#909">source</a></span><a href="#method.split_whitespace" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_whitespace" class="fnname">split_whitespace</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.SplitWhitespace.html" title="struct core::str::iter::SplitWhitespace">SplitWhitespace</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Splits a string slice by whitespace.</p>
<p>The iterator returned will return string slices that are sub-slices of
the original string slice, separated by any amount of whitespace.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>. If you only want to split on ASCII whitespace
instead, use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split_ascii_whitespace"><code>split_ascii_whitespace</code></a>.</p>
<h5 id="examples-19"><a href="#examples-19">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">&quot;A few words&quot;</span>.<span class="ident">split_whitespace</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;A&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;few&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;words&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</code></pre></div>
<p>All kinds of whitespace are considered:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">&quot; Mary had\ta\u{2009}little \n\t lamb&quot;</span>.<span class="ident">split_whitespace</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;Mary&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;had&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;little&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;lamb&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_ascii_whitespace" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.34.0">1.34.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#952">source</a></span><a href="#method.split_ascii_whitespace" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_ascii_whitespace" class="fnname">split_ascii_whitespace</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.SplitAsciiWhitespace.html" title="struct core::str::iter::SplitAsciiWhitespace">SplitAsciiWhitespace</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Splits a string slice by ASCII whitespace.</p>
<p>The iterator returned will return string slices that are sub-slices of
the original string slice, separated by any amount of ASCII whitespace.</p>
<p>To split by Unicode <code>Whitespace</code> instead, use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split_whitespace"><code>split_whitespace</code></a>.</p>
<h5 id="examples-20"><a href="#examples-20">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">&quot;A few words&quot;</span>.<span class="ident">split_ascii_whitespace</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;A&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;few&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;words&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</code></pre></div>
<p>All kinds of ASCII whitespace are considered:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">&quot; Mary had\ta little \n\t lamb&quot;</span>.<span class="ident">split_ascii_whitespace</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;Mary&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;had&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;little&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;lamb&quot;</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.lines" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#998">source</a></span><a href="#method.lines" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.lines" class="fnname">lines</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.Lines.html" title="struct core::str::iter::Lines">Lines</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>An iterator over the lines of a string, as string slices.</p>
<p>Lines are ended with either a newline (<code>\n</code>) or a carriage return with
a line feed (<code>\r\n</code>).</p>
<p>The final line ending is optional. A string that ends with a final line
ending will return the same lines as an otherwise identical string
without a final line ending.</p>
<h5 id="examples-21"><a href="#examples-21">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">&quot;foo\r\nbar\n\nbaz\n&quot;</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lines</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">lines</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;baz&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">lines</span>.<span class="ident">next</span>());</code></pre></div>
<p>The final line ending isn’t required:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">&quot;foo\nbar\n\r\nbaz&quot;</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lines</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">lines</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;baz&quot;</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">lines</span>.<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.lines_any" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1007">source</a></span><a href="#method.lines_any" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.lines_any" class="fnname">lines_any</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.LinesAny.html" title="struct core::str::iter::LinesAny">LinesAny</a>&lt;'_&gt;</h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.4.0: <p>use lines() instead now</p>
</div></div></summary><div class="docblock"><p>An iterator over the lines of a string.</p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.encode_utf16" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.8.0">1.8.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1028">source</a></span><a href="#method.encode_utf16" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.encode_utf16" class="fnname">encode_utf16</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.EncodeUtf16.html" title="struct core::str::iter::EncodeUtf16">EncodeUtf16</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator of <code>u16</code> over the string encoded as UTF-16.</p>
<h5 id="examples-22"><a href="#examples-22">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">&quot;Zażółć gęślą jaźń&quot;</span>;
<span class="kw">let</span> <span class="ident">utf8_len</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">utf16_len</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">encode_utf16</span>().<span class="ident">count</span>();
<span class="macro">assert!</span>(<span class="ident">utf16_len</span> <span class="op">&lt;</span><span class="op">=</span> <span class="ident">utf8_len</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.contains" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1055">source</a></span><a href="#method.contains" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.contains" class="fnname">contains</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the given pattern matches a sub-slice of
this string slice.</p>
<p>Returns <code>false</code> if it does not.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-23"><a href="#examples-23">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">&quot;bananas&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">bananas</span>.<span class="ident">contains</span>(<span class="string">&quot;nana&quot;</span>));
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">contains</span>(<span class="string">&quot;apples&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.starts_with" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1081">source</a></span><a href="#method.starts_with" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.starts_with" class="fnname">starts_with</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the given pattern matches a prefix of this
string slice.</p>
<p>Returns <code>false</code> if it does not.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-24"><a href="#examples-24">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">&quot;bananas&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">bananas</span>.<span class="ident">starts_with</span>(<span class="string">&quot;bana&quot;</span>));
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">starts_with</span>(<span class="string">&quot;nana&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.ends_with" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1107-1109">source</a></span><a href="#method.ends_with" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.ends_with" class="fnname">ends_with</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the given pattern matches a suffix of this
string slice.</p>
<p>Returns <code>false</code> if it does not.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-25"><a href="#examples-25">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">&quot;bananas&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">bananas</span>.<span class="ident">ends_with</span>(<span class="string">&quot;anas&quot;</span>));
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">ends_with</span>(<span class="string">&quot;nana&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.find" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1158">source</a></span><a href="#method.find" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.find" class="fnname">find</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns the byte index of the first character of this string slice that
matches the pattern.</p>
<p>Returns <a href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a> if the pattern doesn’t match.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-26"><a href="#examples-26">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard Gepardi&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&#39;L&#39;</span>), <span class="prelude-val">Some</span>(<span class="number">0</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&#39;é&#39;</span>), <span class="prelude-val">Some</span>(<span class="number">14</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&quot;pard&quot;</span>), <span class="prelude-val">Some</span>(<span class="number">17</span>));</code></pre></div>
<p>More complex patterns using point-free style and closures:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">char::is_whitespace</span>), <span class="prelude-val">Some</span>(<span class="number">5</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">char::is_lowercase</span>), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="op">|</span><span class="ident">c</span>: <span class="ident">char</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">is_whitespace</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">is_lowercase</span>()), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="op">|</span><span class="ident">c</span>: <span class="ident">char</span><span class="op">|</span> (<span class="ident">c</span> <span class="op">&lt;</span> <span class="string">&#39;o&#39;</span>) <span class="op">&amp;&amp;</span> (<span class="ident">c</span> <span class="op">&gt;</span> <span class="string">&#39;a&#39;</span>)), <span class="prelude-val">Some</span>(<span class="number">4</span>));</code></pre></div>
<p>Not finding the pattern:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rfind" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1204-1206">source</a></span><a href="#method.rfind" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rfind" class="fnname">rfind</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns the byte index for the first character of the rightmost match of the pattern in
this string slice.</p>
<p>Returns <a href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a> if the pattern doesn’t match.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-27"><a href="#examples-27">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard Gepardi&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">&#39;L&#39;</span>), <span class="prelude-val">Some</span>(<span class="number">13</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">&#39;é&#39;</span>), <span class="prelude-val">Some</span>(<span class="number">14</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">&quot;pard&quot;</span>), <span class="prelude-val">Some</span>(<span class="number">24</span>));</code></pre></div>
<p>More complex patterns with closures:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">char::is_whitespace</span>), <span class="prelude-val">Some</span>(<span class="number">12</span>));
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">char::is_lowercase</span>), <span class="prelude-val">Some</span>(<span class="number">20</span>));</code></pre></div>
<p>Not finding the pattern:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Löwe 老虎 Léopard&quot;</span>;
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1326">source</a></span><a href="#method.split" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split" class="fnname">split</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.Split.html" title="struct core::str::iter::Split">Split</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of this string slice, separated by
characters matched by a pattern.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior"><a href="#iterator-behavior">Iterator behavior</a></h5>
<p>The returned iterator will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, but not for <code>&amp;str</code>.</p>
<p>If the pattern allows a reverse search but its results might differ
from a forward search, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.rsplit"><code>rsplit</code></a> method can be used.</p>
<h5 id="examples-28"><a href="#examples-28">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lamb&quot;</span>.<span class="ident">split</span>(<span class="string">&#39; &#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;Mary&quot;</span>, <span class="string">&quot;had&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="string">&quot;little&quot;</span>, <span class="string">&quot;lamb&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;&quot;</span>.<span class="ident">split</span>(<span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lionXXtigerXleopard&quot;</span>.<span class="ident">split</span>(<span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lion&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;leopard&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lion::tiger::leopard&quot;</span>.<span class="ident">split</span>(<span class="string">&quot;::&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lion&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;leopard&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abc1def2ghi&quot;</span>.<span class="ident">split</span>(<span class="ident">char::is_numeric</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abc&quot;</span>, <span class="string">&quot;def&quot;</span>, <span class="string">&quot;ghi&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lionXtigerXleopard&quot;</span>.<span class="ident">split</span>(<span class="ident">char::is_uppercase</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lion&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;leopard&quot;</span>]);</code></pre></div>
<p>If the pattern is a slice of chars, split on each occurrence of any of the characters:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;2020-11-03 23:59&quot;</span>.<span class="ident">split</span>(<span class="kw-2">&amp;</span>[<span class="string">&#39;-&#39;</span>, <span class="string">&#39; &#39;</span>, <span class="string">&#39;:&#39;</span>, <span class="string">&#39;@&#39;</span>][..]).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;2020&quot;</span>, <span class="string">&quot;11&quot;</span>, <span class="string">&quot;03&quot;</span>, <span class="string">&quot;23&quot;</span>, <span class="string">&quot;59&quot;</span>]);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abc1defXghi&quot;</span>.<span class="ident">split</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abc&quot;</span>, <span class="string">&quot;def&quot;</span>, <span class="string">&quot;ghi&quot;</span>]);</code></pre></div>
<p>If a string contains multiple contiguous separators, you will end up
with empty strings in the output:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">&quot;||||a||b|c&quot;</span>.<span class="ident">to_string</span>();
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">&#39;|&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">d</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;b&quot;</span>, <span class="string">&quot;c&quot;</span>]);</code></pre></div>
<p>Contiguous separators are separated by the empty string.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">&quot;(///)&quot;</span>.<span class="ident">to_string</span>();
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">d</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;(&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;)&quot;</span>]);</code></pre></div>
<p>Separators at the start or end of a string are neighbored
by empty strings.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;010&quot;</span>.<span class="ident">split</span>(<span class="string">&quot;0&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">d</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;&quot;</span>, <span class="string">&quot;1&quot;</span>, <span class="string">&quot;&quot;</span>]);</code></pre></div>
<p>When the empty string is used as a separator, it separates
every character in the string, along with the beginning
and end of the string.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">f</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;rust&quot;</span>.<span class="ident">split</span>(<span class="string">&quot;&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">f</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;&quot;</span>, <span class="string">&quot;r&quot;</span>, <span class="string">&quot;u&quot;</span>, <span class="string">&quot;s&quot;</span>, <span class="string">&quot;t&quot;</span>, <span class="string">&quot;&quot;</span>]);</code></pre></div>
<p>Contiguous separators can lead to possibly surprising behavior
when whitespace is used as the separator. This code is correct:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">&quot; a b c&quot;</span>.<span class="ident">to_string</span>();
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">&#39; &#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">d</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;b&quot;</span>, <span class="string">&quot;c&quot;</span>]);</code></pre></div>
<p>It does <em>not</em> give you:</p>
<div class='information'><div class='tooltip ignore'>ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered ignore"><code><span class="macro">assert_eq!</span>(<span class="ident">d</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;b&quot;</span>, <span class="string">&quot;c&quot;</span>]);</code></pre></div>
<p>Use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split_whitespace"><code>split_whitespace</code></a> for this behavior.</p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_inclusive" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1366">source</a></span><a href="#method.split_inclusive" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_inclusive" class="fnname">split_inclusive</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.SplitInclusive.html" title="struct core::str::iter::SplitInclusive">SplitInclusive</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of this string slice, separated by
characters matched by a pattern. Differs from the iterator produced by
<code>split</code> in that <code>split_inclusive</code> leaves the matched part as the
terminator of the substring.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-29"><a href="#examples-29">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lamb\nlittle lamb\nlittle lamb.&quot;</span>
.<span class="ident">split_inclusive</span>(<span class="string">&#39;\n&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;Mary had a little lamb\n&quot;</span>, <span class="string">&quot;little lamb\n&quot;</span>, <span class="string">&quot;little lamb.&quot;</span>]);</code></pre></div>
<p>If the last element of the string is matched,
that element will be considered the terminator of the preceding substring.
That substring will be the last item returned by the iterator.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lamb\nlittle lamb\nlittle lamb.\n&quot;</span>
.<span class="ident">split_inclusive</span>(<span class="string">&#39;\n&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;Mary had a little lamb\n&quot;</span>, <span class="string">&quot;little lamb\n&quot;</span>, <span class="string">&quot;little lamb.\n&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rsplit" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1421-1423">source</a></span><a href="#method.rsplit" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rsplit" class="fnname">rsplit</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.RSplit.html" title="struct core::str::iter::RSplit">RSplit</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of the given string slice, separated by
characters matched by a pattern and yielded in reverse order.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-1"><a href="#iterator-behavior-1">Iterator behavior</a></h5>
<p>The returned iterator requires that the pattern supports a reverse
search, and it will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if a forward/reverse
search yields the same elements.</p>
<p>For iterating from the front, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split"><code>split</code></a> method can be used.</p>
<h5 id="examples-30"><a href="#examples-30">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lamb&quot;</span>.<span class="ident">rsplit</span>(<span class="string">&#39; &#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lamb&quot;</span>, <span class="string">&quot;little&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="string">&quot;had&quot;</span>, <span class="string">&quot;Mary&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;&quot;</span>.<span class="ident">rsplit</span>(<span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lionXXtigerXleopard&quot;</span>.<span class="ident">rsplit</span>(<span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;leopard&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;lion&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lion::tiger::leopard&quot;</span>.<span class="ident">rsplit</span>(<span class="string">&quot;::&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;leopard&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;lion&quot;</span>]);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abc1defXghi&quot;</span>.<span class="ident">rsplit</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;ghi&quot;</span>, <span class="string">&quot;def&quot;</span>, <span class="string">&quot;abc&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_terminator" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1472">source</a></span><a href="#method.split_terminator" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_terminator" class="fnname">split_terminator</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.SplitTerminator.html" title="struct core::str::iter::SplitTerminator">SplitTerminator</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of the given string slice, separated by
characters matched by a pattern.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<p>Equivalent to <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split"><code>split</code></a>, except that the trailing substring
is skipped if empty.</p>
<p>This method can be used for string data that is <em>terminated</em>,
rather than <em>separated</em> by a pattern.</p>
<h5 id="iterator-behavior-2"><a href="#iterator-behavior-2">Iterator behavior</a></h5>
<p>The returned iterator will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, but not for <code>&amp;str</code>.</p>
<p>If the pattern allows a reverse search but its results might differ
from a forward search, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.rsplit_terminator"><code>rsplit_terminator</code></a> method can be used.</p>
<h5 id="examples-31"><a href="#examples-31">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A.B.&quot;</span>.<span class="ident">split_terminator</span>(<span class="string">&#39;.&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;A&quot;</span>, <span class="string">&quot;B&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A..B..&quot;</span>.<span class="ident">split_terminator</span>(<span class="string">&quot;.&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;A&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;B&quot;</span>, <span class="string">&quot;&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A.B:C.D&quot;</span>.<span class="ident">split_terminator</span>(<span class="kw-2">&amp;</span>[<span class="string">&#39;.&#39;</span>, <span class="string">&#39;:&#39;</span>][..]).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;A&quot;</span>, <span class="string">&quot;B&quot;</span>, <span class="string">&quot;C&quot;</span>, <span class="string">&quot;D&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rsplit_terminator" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1518-1520">source</a></span><a href="#method.rsplit_terminator" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rsplit_terminator" class="fnname">rsplit_terminator</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.RSplitTerminator.html" title="struct core::str::iter::RSplitTerminator">RSplitTerminator</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of <code>self</code>, separated by characters
matched by a pattern and yielded in reverse order.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<p>Equivalent to <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split"><code>split</code></a>, except that the trailing substring is
skipped if empty.</p>
<p>This method can be used for string data that is <em>terminated</em>,
rather than <em>separated</em> by a pattern.</p>
<h5 id="iterator-behavior-3"><a href="#iterator-behavior-3">Iterator behavior</a></h5>
<p>The returned iterator requires that the pattern supports a
reverse search, and it will be double ended if a forward/reverse
search yields the same elements.</p>
<p>For iterating from the front, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.split_terminator"><code>split_terminator</code></a> method can be
used.</p>
<h5 id="examples-32"><a href="#examples-32">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A.B.&quot;</span>.<span class="ident">rsplit_terminator</span>(<span class="string">&#39;.&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;B&quot;</span>, <span class="string">&quot;A&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A..B..&quot;</span>.<span class="ident">rsplit_terminator</span>(<span class="string">&quot;.&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;&quot;</span>, <span class="string">&quot;B&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;A&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;A.B:C.D&quot;</span>.<span class="ident">rsplit_terminator</span>(<span class="kw-2">&amp;</span>[<span class="string">&#39;.&#39;</span>, <span class="string">&#39;:&#39;</span>][..]).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;D&quot;</span>, <span class="string">&quot;C&quot;</span>, <span class="string">&quot;B&quot;</span>, <span class="string">&quot;A&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.splitn" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1573">source</a></span><a href="#method.splitn" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.splitn" class="fnname">splitn</a>&lt;'a, P&gt;(&amp;'a self, n: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.SplitN.html" title="struct core::str::iter::SplitN">SplitN</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of the given string slice, separated by a
pattern, restricted to returning at most <code>n</code> items.</p>
<p>If <code>n</code> substrings are returned, the last substring (the <code>n</code>th substring)
will contain the remainder of the string.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-4"><a href="#iterator-behavior-4">Iterator behavior</a></h5>
<p>The returned iterator will not be double ended, because it is
not efficient to support.</p>
<p>If the pattern allows a reverse search, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.rsplitn"><code>rsplitn</code></a> method can be
used.</p>
<h5 id="examples-33"><a href="#examples-33">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lambda&quot;</span>.<span class="ident">splitn</span>(<span class="number">3</span>, <span class="string">&#39; &#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;Mary&quot;</span>, <span class="string">&quot;had&quot;</span>, <span class="string">&quot;a little lambda&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lionXXtigerXleopard&quot;</span>.<span class="ident">splitn</span>(<span class="number">3</span>, <span class="string">&quot;X&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lion&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;tigerXleopard&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abcXdef&quot;</span>.<span class="ident">splitn</span>(<span class="number">1</span>, <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abcXdef&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;&quot;</span>.<span class="ident">splitn</span>(<span class="number">1</span>, <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;&quot;</span>]);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abc1defXghi&quot;</span>.<span class="ident">splitn</span>(<span class="number">2</span>, <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abc&quot;</span>, <span class="string">&quot;defXghi&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rsplitn" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1622-1624">source</a></span><a href="#method.rsplitn" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rsplitn" class="fnname">rsplitn</a>&lt;'a, P&gt;(&amp;'a self, n: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.RSplitN.html" title="struct core::str::iter::RSplitN">RSplitN</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over substrings of this string slice, separated by a
pattern, starting from the end of the string, restricted to returning
at most <code>n</code> items.</p>
<p>If <code>n</code> substrings are returned, the last substring (the <code>n</code>th substring)
will contain the remainder of the string.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-5"><a href="#iterator-behavior-5">Iterator behavior</a></h5>
<p>The returned iterator will not be double ended, because it is not
efficient to support.</p>
<p>For splitting from the front, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.splitn"><code>splitn</code></a> method can be used.</p>
<h5 id="examples-34"><a href="#examples-34">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;Mary had a little lamb&quot;</span>.<span class="ident">rsplitn</span>(<span class="number">3</span>, <span class="string">&#39; &#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;lamb&quot;</span>, <span class="string">&quot;little&quot;</span>, <span class="string">&quot;Mary had a&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lionXXtigerXleopard&quot;</span>.<span class="ident">rsplitn</span>(<span class="number">3</span>, <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;leopard&quot;</span>, <span class="string">&quot;tiger&quot;</span>, <span class="string">&quot;lionX&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;lion::tiger::leopard&quot;</span>.<span class="ident">rsplitn</span>(<span class="number">2</span>, <span class="string">&quot;::&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;leopard&quot;</span>, <span class="string">&quot;lion::tiger&quot;</span>]);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abc1defXghi&quot;</span>.<span class="ident">rsplitn</span>(<span class="number">2</span>, <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;ghi&quot;</span>, <span class="string">&quot;abc1def&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.split_once" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.52.0">1.52.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1641">source</a></span><a href="#method.split_once" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.split_once" class="fnname">split_once</a>&lt;'a, P&gt;(&amp;'a self, delimiter: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">(</a>&amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>, &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">)</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Splits the string on the first occurrence of the specified delimiter and
returns prefix before delimiter and suffix after delimiter.</p>
<h5 id="examples-35"><a href="#examples-35">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;cfg&quot;</span>.<span class="ident">split_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;cfg=foo&quot;</span>.<span class="ident">split_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">Some</span>((<span class="string">&quot;cfg&quot;</span>, <span class="string">&quot;foo&quot;</span>)));
<span class="macro">assert_eq!</span>(<span class="string">&quot;cfg=foo=bar&quot;</span>.<span class="ident">split_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">Some</span>((<span class="string">&quot;cfg&quot;</span>, <span class="string">&quot;foo=bar&quot;</span>)));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rsplit_once" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.52.0">1.52.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1659-1661">source</a></span><a href="#method.rsplit_once" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rsplit_once" class="fnname">rsplit_once</a>&lt;'a, P&gt;(&amp;'a self, delimiter: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">(</a>&amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>, &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.tuple.html">)</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Splits the string on the last occurrence of the specified delimiter and
returns prefix before delimiter and suffix after delimiter.</p>
<h5 id="examples-36"><a href="#examples-36">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;cfg&quot;</span>.<span class="ident">rsplit_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;cfg=foo&quot;</span>.<span class="ident">rsplit_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">Some</span>((<span class="string">&quot;cfg&quot;</span>, <span class="string">&quot;foo&quot;</span>)));
<span class="macro">assert_eq!</span>(<span class="string">&quot;cfg=foo=bar&quot;</span>.<span class="ident">rsplit_once</span>(<span class="string">&#39;=&#39;</span>), <span class="prelude-val">Some</span>((<span class="string">&quot;cfg=foo&quot;</span>, <span class="string">&quot;bar&quot;</span>)));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0">1.2.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1701">source</a></span><a href="#method.matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.matches" class="fnname">matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.Matches.html" title="struct core::str::iter::Matches">Matches</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over the disjoint matches of a pattern within the given string
slice.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-6"><a href="#iterator-behavior-6">Iterator behavior</a></h5>
<p>The returned iterator will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, but not for <code>&amp;str</code>.</p>
<p>If the pattern allows a reverse search but its results might differ
from a forward search, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.matches"><code>rmatches</code></a> method can be used.</p>
<h5 id="examples-37"><a href="#examples-37">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abcXXXabcYYYabc&quot;</span>.<span class="ident">matches</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abc&quot;</span>, <span class="string">&quot;abc&quot;</span>, <span class="string">&quot;abc&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;1abc2abc3&quot;</span>.<span class="ident">matches</span>(<span class="ident">char::is_numeric</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;1&quot;</span>, <span class="string">&quot;2&quot;</span>, <span class="string">&quot;3&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rmatches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0">1.2.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1737-1739">source</a></span><a href="#method.rmatches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rmatches" class="fnname">rmatches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.RMatches.html" title="struct core::str::iter::RMatches">RMatches</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over the disjoint matches of a pattern within this string slice,
yielded in reverse order.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-7"><a href="#iterator-behavior-7">Iterator behavior</a></h5>
<p>The returned iterator requires that the pattern supports a reverse
search, and it will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if a forward/reverse
search yields the same elements.</p>
<p>For iterating from the front, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.matches"><code>matches</code></a> method can be used.</p>
<h5 id="examples-38"><a href="#examples-38">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abcXXXabcYYYabc&quot;</span>.<span class="ident">rmatches</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;abc&quot;</span>, <span class="string">&quot;abc&quot;</span>, <span class="string">&quot;abc&quot;</span>]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;1abc2abc3&quot;</span>.<span class="ident">rmatches</span>(<span class="ident">char::is_numeric</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [<span class="string">&quot;3&quot;</span>, <span class="string">&quot;2&quot;</span>, <span class="string">&quot;1&quot;</span>]);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.match_indices" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1783">source</a></span><a href="#method.match_indices" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.match_indices" class="fnname">match_indices</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.MatchIndices.html" title="struct core::str::iter::MatchIndices">MatchIndices</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over the disjoint matches of a pattern within this string
slice as well as the index that the match starts at.</p>
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
corresponding to the first match are returned.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-8"><a href="#iterator-behavior-8">Iterator behavior</a></h5>
<p>The returned iterator will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, but not for <code>&amp;str</code>.</p>
<p>If the pattern allows a reverse search but its results might differ
from a forward search, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.rmatch_indices"><code>rmatch_indices</code></a> method can be used.</p>
<h5 id="examples-39"><a href="#examples-39">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abcXXXabcYYYabc&quot;</span>.<span class="ident">match_indices</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">0</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">6</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">12</span>, <span class="string">&quot;abc&quot;</span>)]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;1abcabc2&quot;</span>.<span class="ident">match_indices</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">1</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">4</span>, <span class="string">&quot;abc&quot;</span>)]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;ababa&quot;</span>.<span class="ident">match_indices</span>(<span class="string">&quot;aba&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">0</span>, <span class="string">&quot;aba&quot;</span>)]); <span class="comment">// only the first `aba`</span></code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.rmatch_indices" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1825-1827">source</a></span><a href="#method.rmatch_indices" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.rmatch_indices" class="fnname">rmatch_indices</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.RMatchIndices.html" title="struct core::str::iter::RMatchIndices">RMatchIndices</a>&lt;'a, P&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>An iterator over the disjoint matches of a pattern within <code>self</code>,
yielded in reverse order along with the index of the match.</p>
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
corresponding to the last match are returned.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="iterator-behavior-9"><a href="#iterator-behavior-9">Iterator behavior</a></h5>
<p>The returned iterator requires that the pattern supports a reverse
search, and it will be a <a href="https://doc.rust-lang.org/1.61.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="DoubleEndedIterator"><code>DoubleEndedIterator</code></a> if a forward/reverse
search yields the same elements.</p>
<p>For iterating from the front, the <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.match_indices"><code>match_indices</code></a> method can be used.</p>
<h5 id="examples-40"><a href="#examples-40">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;abcXXXabcYYYabc&quot;</span>.<span class="ident">rmatch_indices</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">12</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">6</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">0</span>, <span class="string">&quot;abc&quot;</span>)]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;1abcabc2&quot;</span>.<span class="ident">rmatch_indices</span>(<span class="string">&quot;abc&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">4</span>, <span class="string">&quot;abc&quot;</span>), (<span class="number">1</span>, <span class="string">&quot;abc&quot;</span>)]);
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="string">&quot;ababa&quot;</span>.<span class="ident">rmatch_indices</span>(<span class="string">&quot;aba&quot;</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, [(<span class="number">2</span>, <span class="string">&quot;aba&quot;</span>)]); <span class="comment">// only the last `aba`</span></code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1851">source</a></span><a href="#method.trim" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim" class="fnname">trim</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns a string slice with leading and trailing whitespace removed.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>.</p>
<h5 id="examples-41"><a href="#examples-41">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; Hello\tworld\t&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;Hello\tworld&quot;</span>, <span class="ident">s</span>.<span class="ident">trim</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_start" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1890">source</a></span><a href="#method.trim_start" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_start" class="fnname">trim_start</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns a string slice with leading whitespace removed.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>.</p>
<h5 id="text-directionality"><a href="#text-directionality">Text directionality</a></h5>
<p>A string is a sequence of bytes. <code>start</code> in this context means the first
position of that byte string; for a left-to-right language like English or
Russian, this will be left side, and for right-to-left languages like
Arabic or Hebrew, this will be the right side.</p>
<h5 id="examples-42"><a href="#examples-42">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; Hello\tworld\t&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;Hello\tworld\t&quot;</span>, <span class="ident">s</span>.<span class="ident">trim_start</span>());</code></pre></div>
<p>Directionality:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; English &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;E&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_start</span>().<span class="ident">chars</span>().<span class="ident">next</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; עברית &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;ע&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_start</span>().<span class="ident">chars</span>().<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_end" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1929">source</a></span><a href="#method.trim_end" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_end" class="fnname">trim_end</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns a string slice with trailing whitespace removed.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>.</p>
<h5 id="text-directionality-1"><a href="#text-directionality-1">Text directionality</a></h5>
<p>A string is a sequence of bytes. <code>end</code> in this context means the last
position of that byte string; for a left-to-right language like English or
Russian, this will be right side, and for right-to-left languages like
Arabic or Hebrew, this will be the left side.</p>
<h5 id="examples-43"><a href="#examples-43">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; Hello\tworld\t&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot; Hello\tworld&quot;</span>, <span class="ident">s</span>.<span class="ident">trim_end</span>());</code></pre></div>
<p>Directionality:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; English &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;h&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_end</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; עברית &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;ת&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_end</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_left" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#1973">source</a></span><a href="#method.trim_left" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_left" class="fnname">trim_left</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.33.0: <p>superseded by <code>trim_start</code></p>
</div></div></summary><div class="docblock"><p>Returns a string slice with leading whitespace removed.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>.</p>
<h5 id="text-directionality-2"><a href="#text-directionality-2">Text directionality</a></h5>
<p>A string is a sequence of bytes. ‘Left’ in this context means the first
position of that byte string; for a language like Arabic or Hebrew
which are ‘right to left’ rather than ‘left to right’, this will be
the <em>right</em> side, not the left.</p>
<h5 id="examples-44"><a href="#examples-44">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; Hello\tworld\t&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;Hello\tworld\t&quot;</span>, <span class="ident">s</span>.<span class="ident">trim_left</span>());</code></pre></div>
<p>Directionality:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; English&quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;E&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_left</span>().<span class="ident">chars</span>().<span class="ident">next</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; עברית&quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;ע&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_left</span>().<span class="ident">chars</span>().<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_right" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2017">source</a></span><a href="#method.trim_right" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_right" class="fnname">trim_right</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a></h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.33.0: <p>superseded by <code>trim_end</code></p>
</div></div></summary><div class="docblock"><p>Returns a string slice with trailing whitespace removed.</p>
<p>‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property <code>White_Space</code>.</p>
<h5 id="text-directionality-3"><a href="#text-directionality-3">Text directionality</a></h5>
<p>A string is a sequence of bytes. ‘Right’ in this context means the last
position of that byte string; for a language like Arabic or Hebrew
which are ‘right to left’ rather than ‘left to right’, this will be
the <em>left</em> side, not the right.</p>
<h5 id="examples-45"><a href="#examples-45">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot; Hello\tworld\t&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot; Hello\tworld&quot;</span>, <span class="ident">s</span>.<span class="ident">trim_right</span>());</code></pre></div>
<p>Directionality:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;English &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;h&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_right</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;עברית &quot;</span>;
<span class="macro">assert!</span>(<span class="prelude-val">Some</span>(<span class="string">&#39;ת&#39;</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_right</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2050-2052">source</a></span><a href="#method.trim_matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_matches" class="fnname">trim_matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a string slice with all prefixes and suffixes that match a
pattern repeatedly removed.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a function
or closure that determines if a character matches.</p>
<h5 id="examples-46"><a href="#examples-46">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;11foo1bar11&quot;</span>.<span class="ident">trim_matches</span>(<span class="string">&#39;1&#39;</span>), <span class="string">&quot;foo1bar&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;123foo1bar123&quot;</span>.<span class="ident">trim_matches</span>(<span class="ident">char::is_numeric</span>), <span class="string">&quot;foo1bar&quot;</span>);
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="string">&quot;12foo1bar12&quot;</span>.<span class="ident">trim_matches</span>(<span class="ident">x</span>), <span class="string">&quot;foo1bar&quot;</span>);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;1foo1barXX&quot;</span>.<span class="ident">trim_matches</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>), <span class="string">&quot;foo1bar&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_start_matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2099">source</a></span><a href="#method.trim_start_matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_start_matches" class="fnname">trim_start_matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a string slice with all prefixes that match a pattern
repeatedly removed.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="text-directionality-4"><a href="#text-directionality-4">Text directionality</a></h5>
<p>A string is a sequence of bytes. <code>start</code> in this context means the first
position of that byte string; for a left-to-right language like English or
Russian, this will be left side, and for right-to-left languages like
Arabic or Hebrew, this will be the right side.</p>
<h5 id="examples-47"><a href="#examples-47">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;11foo1bar11&quot;</span>.<span class="ident">trim_start_matches</span>(<span class="string">&#39;1&#39;</span>), <span class="string">&quot;foo1bar11&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;123foo1bar123&quot;</span>.<span class="ident">trim_start_matches</span>(<span class="ident">char::is_numeric</span>), <span class="string">&quot;foo1bar123&quot;</span>);
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="string">&quot;12foo1bar12&quot;</span>.<span class="ident">trim_start_matches</span>(<span class="ident">x</span>), <span class="string">&quot;foo1bar12&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.strip_prefix" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.45.0">1.45.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2132">source</a></span><a href="#method.strip_prefix" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.strip_prefix" class="fnname">strip_prefix</a>&lt;'a, P&gt;(&amp;'a self, prefix: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a string slice with the prefix removed.</p>
<p>If the string starts with the pattern <code>prefix</code>, returns substring after the prefix, wrapped
in <code>Some</code>. Unlike <code>trim_start_matches</code>, this method removes the prefix exactly once.</p>
<p>If the string does not start with <code>prefix</code>, returns <code>None</code>.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-48"><a href="#examples-48">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;foo:bar&quot;</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;foo:&quot;</span>), <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;foo:bar&quot;</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;bar&quot;</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;foofoo&quot;</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;foo&quot;</span>), <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.strip_suffix" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.45.0">1.45.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2159-2162">source</a></span><a href="#method.strip_suffix" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.strip_suffix" class="fnname">strip_suffix</a>&lt;'a, P&gt;(&amp;'a self, suffix: P) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a string slice with the suffix removed.</p>
<p>If the string ends with the pattern <code>suffix</code>, returns the substring before the suffix,
wrapped in <code>Some</code>. Unlike <code>trim_end_matches</code>, this method removes the suffix exactly once.</p>
<p>If the string does not end with <code>suffix</code>, returns <code>None</code>.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="examples-49"><a href="#examples-49">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;bar:foo&quot;</span>.<span class="ident">strip_suffix</span>(<span class="string">&quot;:foo&quot;</span>), <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;bar:foo&quot;</span>.<span class="ident">strip_suffix</span>(<span class="string">&quot;bar&quot;</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;foofoo&quot;</span>.<span class="ident">strip_suffix</span>(<span class="string">&quot;foo&quot;</span>), <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_end_matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2203-2205">source</a></span><a href="#method.trim_end_matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_end_matches" class="fnname">trim_end_matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Returns a string slice with all suffixes that match a pattern
repeatedly removed.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="text-directionality-5"><a href="#text-directionality-5">Text directionality</a></h5>
<p>A string is a sequence of bytes. <code>end</code> in this context means the last
position of that byte string; for a left-to-right language like English or
Russian, this will be right side, and for right-to-left languages like
Arabic or Hebrew, this will be the left side.</p>
<h5 id="examples-50"><a href="#examples-50">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;11foo1bar11&quot;</span>.<span class="ident">trim_end_matches</span>(<span class="string">&#39;1&#39;</span>), <span class="string">&quot;11foo1bar&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;123foo1bar123&quot;</span>.<span class="ident">trim_end_matches</span>(<span class="ident">char::is_numeric</span>), <span class="string">&quot;123foo1bar&quot;</span>);
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="string">&quot;12foo1bar12&quot;</span>.<span class="ident">trim_end_matches</span>(<span class="ident">x</span>), <span class="string">&quot;12foo1bar&quot;</span>);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;1fooX&quot;</span>.<span class="ident">trim_end_matches</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>), <span class="string">&quot;1foo&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_left_matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2249">source</a></span><a href="#method.trim_left_matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_left_matches" class="fnname">trim_left_matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.33.0: <p>superseded by <code>trim_start_matches</code></p>
</div></div></summary><div class="docblock"><p>Returns a string slice with all prefixes that match a pattern
repeatedly removed.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="text-directionality-6"><a href="#text-directionality-6">Text directionality</a></h5>
<p>A string is a sequence of bytes. ‘Left’ in this context means the first
position of that byte string; for a language like Arabic or Hebrew
which are ‘right to left’ rather than ‘left to right’, this will be
the <em>right</em> side, not the left.</p>
<h5 id="examples-51"><a href="#examples-51">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;11foo1bar11&quot;</span>.<span class="ident">trim_left_matches</span>(<span class="string">&#39;1&#39;</span>), <span class="string">&quot;foo1bar11&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;123foo1bar123&quot;</span>.<span class="ident">trim_left_matches</span>(<span class="ident">char::is_numeric</span>), <span class="string">&quot;foo1bar123&quot;</span>);
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="string">&quot;12foo1bar12&quot;</span>.<span class="ident">trim_left_matches</span>(<span class="ident">x</span>), <span class="string">&quot;foo1bar12&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.trim_right_matches" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2292-2294">source</a></span><a href="#method.trim_right_matches" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.trim_right_matches" class="fnname">trim_right_matches</a>&lt;'a, P&gt;(&amp;'a self, pat: P) -&gt; &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;P as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a>&lt;'a&gt;,&nbsp;</span></h4></section><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.33.0: <p>superseded by <code>trim_end_matches</code></p>
</div></div></summary><div class="docblock"><p>Returns a string slice with all suffixes that match a pattern
repeatedly removed.</p>
<p>The <a href="https://doc.rust-lang.org/1.61.0/core/str/pattern/index.html">pattern</a> can be a <code>&amp;str</code>, <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>, a slice of <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html"><code>char</code></a>s, or a
function or closure that determines if a character matches.</p>
<h5 id="text-directionality-7"><a href="#text-directionality-7">Text directionality</a></h5>
<p>A string is a sequence of bytes. ‘Right’ in this context means the last
position of that byte string; for a language like Arabic or Hebrew
which are ‘right to left’ rather than ‘left to right’, this will be
the <em>left</em> side, not the right.</p>
<h5 id="examples-52"><a href="#examples-52">Examples</a></h5>
<p>Simple patterns:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;11foo1bar11&quot;</span>.<span class="ident">trim_right_matches</span>(<span class="string">&#39;1&#39;</span>), <span class="string">&quot;11foo1bar&quot;</span>);
<span class="macro">assert_eq!</span>(<span class="string">&quot;123foo1bar123&quot;</span>.<span class="ident">trim_right_matches</span>(<span class="ident">char::is_numeric</span>), <span class="string">&quot;123foo1bar&quot;</span>);
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="string">&#39;1&#39;</span>, <span class="string">&#39;2&#39;</span>];
<span class="macro">assert_eq!</span>(<span class="string">&quot;12foo1bar12&quot;</span>.<span class="ident">trim_right_matches</span>(<span class="ident">x</span>), <span class="string">&quot;12foo1bar&quot;</span>);</code></pre></div>
<p>A more complex pattern, using a closure:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;1fooX&quot;</span>.<span class="ident">trim_right_matches</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;1&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;X&#39;</span>), <span class="string">&quot;1foo&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.parse" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2344">source</a></span><a href="#method.parse" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.parse" class="fnname">parse</a>&lt;F&gt;(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;F, &lt;F as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/traits/trait.FromStr.html" title="trait core::str::traits::FromStr">FromStr</a>&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/str/traits/trait.FromStr.html#associatedtype.Err" title="type core::str::traits::FromStr::Err">Err</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/traits/trait.FromStr.html" title="trait core::str::traits::FromStr">FromStr</a>,&nbsp;</span></h4></section></summary><div class="docblock"><p>Parses this string slice into another type.</p>
<p>Because <code>parse</code> is so general, it can cause problems with type
inference. As such, <code>parse</code> is one of the few times you’ll see
the syntax affectionately known as the ‘turbofish’: <code>::&lt;&gt;</code>. This
helps the inference algorithm understand specifically which type
you’re trying to parse into.</p>
<p><code>parse</code> can parse into any type that implements the <a href="https://doc.rust-lang.org/1.61.0/core/str/traits/trait.FromStr.html" title="FromStr"><code>FromStr</code></a> trait.</p>
<h5 id="errors"><a href="#errors">Errors</a></h5>
<p>Will return <a href="https://doc.rust-lang.org/1.61.0/core/str/traits/trait.FromStr.html#associatedtype.Err"><code>Err</code></a> if it’s not possible to parse this string slice into
the desired type.</p>
<h5 id="examples-53"><a href="#examples-53">Examples</a></h5>
<p>Basic usage</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">four</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="string">&quot;4&quot;</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq!</span>(<span class="number">4</span>, <span class="ident">four</span>);</code></pre></div>
<p>Using the ‘turbofish’ instead of annotating <code>four</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">four</span> <span class="op">=</span> <span class="string">&quot;4&quot;</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>();
<span class="macro">assert_eq!</span>(<span class="prelude-val">Ok</span>(<span class="number">4</span>), <span class="ident">four</span>);</code></pre></div>
<p>Failing to parse:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">nope</span> <span class="op">=</span> <span class="string">&quot;j&quot;</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>();
<span class="macro">assert!</span>(<span class="ident">nope</span>.<span class="ident">is_err</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_ascii" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2362">source</a></span><a href="#method.is_ascii" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.is_ascii" class="fnname">is_ascii</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Checks if all characters in this string are within the ASCII range.</p>
<h5 id="examples-54"><a href="#examples-54">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">ascii</span> <span class="op">=</span> <span class="string">&quot;hello!\n&quot;</span>;
<span class="kw">let</span> <span class="ident">non_ascii</span> <span class="op">=</span> <span class="string">&quot;Grüße, Jürgen ❤&quot;</span>;
<span class="macro">assert!</span>(<span class="ident">ascii</span>.<span class="ident">is_ascii</span>());
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">non_ascii</span>.<span class="ident">is_ascii</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.eq_ignore_ascii_case" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2384">source</a></span><a href="#method.eq_ignore_ascii_case" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.eq_ignore_ascii_case" class="fnname">eq_ignore_ascii_case</a>(&amp;self, other: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Checks that two strings are an ASCII case-insensitive match.</p>
<p>Same as <code>to_ascii_lowercase(a) == to_ascii_lowercase(b)</code>,
but without allocating and copying temporaries.</p>
<h5 id="examples-55"><a href="#examples-55">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert!</span>(<span class="string">&quot;Ferris&quot;</span>.<span class="ident">eq_ignore_ascii_case</span>(<span class="string">&quot;FERRIS&quot;</span>));
<span class="macro">assert!</span>(<span class="string">&quot;Ferrös&quot;</span>.<span class="ident">eq_ignore_ascii_case</span>(<span class="string">&quot;FERRöS&quot;</span>));
<span class="macro">assert!</span>(<span class="op">!</span><span class="string">&quot;Ferrös&quot;</span>.<span class="ident">eq_ignore_ascii_case</span>(<span class="string">&quot;FERRÖS&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.escape_debug" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.34.0">1.34.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2479">source</a></span><a href="#method.escape_debug" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.escape_debug" class="fnname">escape_debug</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.EscapeDebug.html" title="struct core::str::iter::EscapeDebug">EscapeDebug</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Return an iterator that escapes each char in <code>self</code> with <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html#method.escape_debug" title="char::escape_debug"><code>char::escape_debug</code></a>.</p>
<p>Note: only extended grapheme codepoints that begin the string will be
escaped.</p>
<h5 id="examples-56"><a href="#examples-56">Examples</a></h5>
<p>As an iterator:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_debug</span>() {
<span class="macro">print!</span>(<span class="string">&quot;{c}&quot;</span>);
}
<span class="macro">println!</span>();</code></pre></div>
<p>Using <code>println!</code> directly:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_debug</span>());</code></pre></div>
<p>Both are equivalent to:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;❤\\n!&quot;</span>);</code></pre></div>
<p>Using <code>to_string</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_debug</span>().<span class="ident">to_string</span>(), <span class="string">&quot;❤\\n!&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.escape_default" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.34.0">1.34.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2525">source</a></span><a href="#method.escape_default" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.escape_default" class="fnname">escape_default</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.EscapeDefault.html" title="struct core::str::iter::EscapeDefault">EscapeDefault</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Return an iterator that escapes each char in <code>self</code> with <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html#method.escape_default" title="char::escape_default"><code>char::escape_default</code></a>.</p>
<h5 id="examples-57"><a href="#examples-57">Examples</a></h5>
<p>As an iterator:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_default</span>() {
<span class="macro">print!</span>(<span class="string">&quot;{c}&quot;</span>);
}
<span class="macro">println!</span>();</code></pre></div>
<p>Using <code>println!</code> directly:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_default</span>());</code></pre></div>
<p>Both are equivalent to:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;\\u{{2764}}\\n!&quot;</span>);</code></pre></div>
<p>Using <code>to_string</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_default</span>().<span class="ident">to_string</span>(), <span class="string">&quot;\\u{2764}\\n!&quot;</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.escape_unicode" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.34.0">1.34.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/str/mod.rs.html#2563">source</a></span><a href="#method.escape_unicode" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.escape_unicode" class="fnname">escape_unicode</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/str/iter/struct.EscapeUnicode.html" title="struct core::str::iter::EscapeUnicode">EscapeUnicode</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Return an iterator that escapes each char in <code>self</code> with <a href="https://doc.rust-lang.org/1.61.0/std/primitive.char.html#method.escape_unicode" title="char::escape_unicode"><code>char::escape_unicode</code></a>.</p>
<h5 id="examples-58"><a href="#examples-58">Examples</a></h5>
<p>As an iterator:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_unicode</span>() {
<span class="macro">print!</span>(<span class="string">&quot;{c}&quot;</span>);
}
<span class="macro">println!</span>();</code></pre></div>
<p>Using <code>println!</code> directly:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_unicode</span>());</code></pre></div>
<p>Both are equivalent to:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">println!</span>(<span class="string">&quot;\\u{{2764}}\\u{{a}}\\u{{21}}&quot;</span>);</code></pre></div>
<p>Using <code>to_string</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;❤\n!&quot;</span>.<span class="ident">escape_unicode</span>().<span class="ident">to_string</span>(), <span class="string">&quot;\\u{2764}\\u{a}\\u{21}&quot;</span>);</code></pre></div>
</div></details></div><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.replace" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#289">source</a></span><a href="#method.replace" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.replace" class="fnname">replace</a>&lt;'a, P&gt;(&amp;'a self, from: P, to: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Replaces all matches of a pattern with another string.</p>
<p><code>replace</code> creates a new <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a>, and copies the data from this string slice into it.
While doing so, it attempts to find matches of a pattern. If it finds any, it
replaces them with the replacement string slice.</p>
<h5 id="examples-59"><a href="#examples-59">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;this is old&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;this is new&quot;</span>, <span class="ident">s</span>.<span class="ident">replace</span>(<span class="string">&quot;old&quot;</span>, <span class="string">&quot;new&quot;</span>));</code></pre></div>
<p>When the pattern doesn’t match:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;this is old&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>, <span class="ident">s</span>.<span class="ident">replace</span>(<span class="string">&quot;cookie monster&quot;</span>, <span class="string">&quot;little lamb&quot;</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.replacen" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#329">source</a></span><a href="#method.replacen" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.replacen" class="fnname">replacen</a>&lt;'a, P&gt;(&amp;'a self, pat: P, to: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html">str</a>, count: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;P: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a>&lt;'a&gt;,&nbsp;</span></h4></section></summary><div class="docblock"><p>Replaces first N matches of a pattern with another string.</p>
<p><code>replacen</code> creates a new <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a>, and copies the data from this string slice into it.
While doing so, it attempts to find matches of a pattern. If it finds any, it
replaces them with the replacement string slice at most <code>count</code> times.</p>
<h5 id="examples-60"><a href="#examples-60">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;foo foo 123 foo&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;new new 123 foo&quot;</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">&quot;foo&quot;</span>, <span class="string">&quot;new&quot;</span>, <span class="number">2</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;faa fao 123 foo&quot;</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">&#39;o&#39;</span>, <span class="string">&quot;a&quot;</span>, <span class="number">3</span>));
<span class="macro">assert_eq!</span>(<span class="string">&quot;foo foo new23 foo&quot;</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="ident">char::is_numeric</span>, <span class="string">&quot;new&quot;</span>, <span class="number">1</span>));</code></pre></div>
<p>When the pattern doesn’t match:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;this is old&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">s</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">&quot;cookie monster&quot;</span>, <span class="string">&quot;little lamb&quot;</span>, <span class="number">10</span>));</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_lowercase" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0">1.2.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#386">source</a></span><a href="#method.to_lowercase" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.to_lowercase" class="fnname">to_lowercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Returns the lowercase equivalent of this string slice, as a new <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a>.</p>
<p>‘Lowercase’ is defined according to the terms of the Unicode Derived Core Property
<code>Lowercase</code>.</p>
<p>Since some characters can expand into multiple characters when changing
the case, this function returns a <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a> instead of modifying the
parameter in-place.</p>
<h5 id="examples-61"><a href="#examples-61">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;HELLO&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;hello&quot;</span>, <span class="ident">s</span>.<span class="ident">to_lowercase</span>());</code></pre></div>
<p>A tricky example, with sigma:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">sigma</span> <span class="op">=</span> <span class="string">&quot;Σ&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;σ&quot;</span>, <span class="ident">sigma</span>.<span class="ident">to_lowercase</span>());
<span class="comment">// but at the end of a word, it&#39;s ς, not σ:</span>
<span class="kw">let</span> <span class="ident">odysseus</span> <span class="op">=</span> <span class="string">&quot;ὈΔΥΣΣΕΎΣ&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;ὀδυσσεύς&quot;</span>, <span class="ident">odysseus</span>.<span class="ident">to_lowercase</span>());</code></pre></div>
<p>Languages without case are not changed:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">new_year</span> <span class="op">=</span> <span class="string">&quot;农历新年&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">new_year</span>, <span class="ident">new_year</span>.<span class="ident">to_lowercase</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_uppercase" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0">1.2.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#469">source</a></span><a href="#method.to_uppercase" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.to_uppercase" class="fnname">to_uppercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Returns the uppercase equivalent of this string slice, as a new <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a>.</p>
<p>‘Uppercase’ is defined according to the terms of the Unicode Derived Core Property
<code>Uppercase</code>.</p>
<p>Since some characters can expand into multiple characters when changing
the case, this function returns a <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a> instead of modifying the
parameter in-place.</p>
<h5 id="examples-62"><a href="#examples-62">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;hello&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;HELLO&quot;</span>, <span class="ident">s</span>.<span class="ident">to_uppercase</span>());</code></pre></div>
<p>Scripts without case are not changed:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">new_year</span> <span class="op">=</span> <span class="string">&quot;农历新年&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="ident">new_year</span>, <span class="ident">new_year</span>.<span class="ident">to_uppercase</span>());</code></pre></div>
<p>One character can become multiple:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;tschüß&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;TSCHÜSS&quot;</span>, <span class="ident">s</span>.<span class="ident">to_uppercase</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.repeat" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#533">source</a></span><a href="#method.repeat" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.repeat" class="fnname">repeat</a>(&amp;self, n: <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Creates a new <a href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="String"><code>String</code></a> by repeating a string <code>n</code> times.</p>
<h5 id="panics-2"><a href="#panics-2">Panics</a></h5>
<p>This function will panic if the capacity would overflow.</p>
<h5 id="examples-63"><a href="#examples-63">Examples</a></h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">&quot;abc&quot;</span>.<span class="ident">repeat</span>(<span class="number">4</span>), <span class="ident">String::from</span>(<span class="string">&quot;abcabcabcabc&quot;</span>));</code></pre></div>
<p>A panic upon overflow:</p>
<div class='information'><div class='tooltip should_panic'>ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered should_panic"><code><span class="comment">// this will panic at runtime</span>
<span class="kw">let</span> <span class="ident">huge</span> <span class="op">=</span> <span class="string">&quot;0123456789abcdef&quot;</span>.<span class="ident">repeat</span>(<span class="ident">usize::MAX</span>);</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_ascii_uppercase" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#563">source</a></span><a href="#method.to_ascii_uppercase" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.to_ascii_uppercase" class="fnname">to_ascii_uppercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Returns a copy of this string where each character is mapped to its
ASCII upper case equivalent.</p>
<p>ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’,
but non-ASCII letters are unchanged.</p>
<p>To uppercase the value in-place, use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.make_ascii_uppercase"><code>make_ascii_uppercase</code></a>.</p>
<p>To uppercase ASCII characters in addition to non-ASCII characters, use
<a href="#method.to_uppercase"><code>to_uppercase</code></a>.</p>
<h5 id="examples-64"><a href="#examples-64">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Grüße, Jürgen ❤&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;GRüßE, JüRGEN ❤&quot;</span>, <span class="ident">s</span>.<span class="ident">to_ascii_uppercase</span>());</code></pre></div>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_ascii_lowercase" class="method has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/alloc/str.rs.html#596">source</a></span><a href="#method.to_ascii_lowercase" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.to_ascii_lowercase" class="fnname">to_ascii_lowercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Returns a copy of this string where each character is mapped to its
ASCII lower case equivalent.</p>
<p>ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’,
but non-ASCII letters are unchanged.</p>
<p>To lowercase the value in-place, use <a href="https://doc.rust-lang.org/1.61.0/std/primitive.str.html#method.make_ascii_lowercase"><code>make_ascii_lowercase</code></a>.</p>
<p>To lowercase ASCII characters in addition to non-ASCII characters, use
<a href="#method.to_lowercase"><code>to_lowercase</code></a>.</p>
<h5 id="examples-65"><a href="#examples-65">Examples</a></h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;Grüße, Jürgen ❤&quot;</span>;
<span class="macro">assert_eq!</span>(<span class="string">&quot;grüße, jürgen ❤&quot;</span>, <span class="ident">s</span>.<span class="ident">to_ascii_lowercase</span>());</code></pre></div>
</div></details></div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Deref" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/abstio/abst_paths.rs.html#14-57">source</a></span><a href="#impl-Deref" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Target" class="type trait-impl has-srclink"><a href="#associatedtype.Target" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.61.0/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = <a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class='docblock'><p>The resulting type after dereferencing.</p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/abstio/abst_paths.rs.html#14-57">source</a></span><a href="#method.deref" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/ops/deref/trait.Deref.html#tymethod.deref" class="fnname">deref</a>(&amp;self) -&gt; &amp;<a class="struct" href="https://doc.rust-lang.org/1.61.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class='docblock'><p>Dereferences the value.</p>
</div></details></div></details><section id="impl-LazyStatic" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/abstio/abst_paths.rs.html#14-57">source</a></span><a href="#impl-LazyStatic" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://docs.rs/lazy_static/1.4.0/lazy_static/trait.LazyStatic.html" title="trait lazy_static::LazyStatic">LazyStatic</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe" class="impl has-srclink"><a href="#impl-RefUnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section><section id="impl-Send" class="impl has-srclink"><a href="#impl-Send" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section><section id="impl-Sync" class="impl has-srclink"><a href="#impl-Sync" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section><section id="impl-Unpin" class="impl has-srclink"><a href="#impl-Unpin" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section><section id="impl-UnwindSafe" class="impl has-srclink"><a href="#impl-UnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.ROOT_PLAYER_DIR.html" title="struct abstio::abst_paths::ROOT_PLAYER_DIR">ROOT_PLAYER_DIR</a></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/any.rs.html#132-136">source</a></span><a href="#impl-Any" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/any.rs.html#133">source</a></span><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.61.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.61.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/borrow.rs.html#209-214">source</a></span><a href="#impl-Borrow%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/borrow.rs.html#211">source</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.reference.html">&amp;</a>T</h4></section></summary><div class='docblock'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/borrow.rs.html#218-222">source</a></span><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.61.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/borrow.rs.html#219">source</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.61.0/std/primitive.reference.html">&amp;mut </a>T</h4></section></summary><div class='docblock'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.61.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#557-562">source</a></span><a href="#impl-From%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#559">source</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Instrument" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://docs.rs/tracing/0.1.26/src/tracing/instrument.rs.html#155">source</a></span><a href="#impl-Instrument" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://docs.rs/tracing/0.1.26/tracing/instrument/trait.Instrument.html" title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.instrument" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="https://docs.rs/tracing/0.1.26/src/tracing/instrument.rs.html#38">source</a></span><a href="#method.instrument" class="anchor"></a><h4 class="code-header">fn <a href="https://docs.rs/tracing/0.1.26/tracing/instrument/trait.Instrument.html#method.instrument" class="fnname">instrument</a>(self, span: <a class="struct" href="https://docs.rs/tracing/0.1.26/tracing/span/struct.Span.html" title="struct tracing::span::Span">Span</a>) -&gt; <a class="struct" href="https://docs.rs/tracing/0.1.26/tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'><p>Instruments this type with the provided <code>Span</code>, returning an
<code>Instrumented</code> wrapper. <a href="https://docs.rs/tracing/0.1.26/tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.in_current_span" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="https://docs.rs/tracing/0.1.26/src/tracing/instrument.rs.html#74">source</a></span><a href="#method.in_current_span" class="anchor"></a><h4 class="code-header">fn <a href="https://docs.rs/tracing/0.1.26/tracing/instrument/trait.Instrument.html#method.in_current_span" class="fnname">in_current_span</a>(self) -&gt; <a class="struct" href="https://docs.rs/tracing/0.1.26/tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'><p>Instruments this type with the <a href="../struct.Span.html#method.current">current</a> <code>Span</code>, returning an
<code>Instrumented</code> wrapper. <a href="https://docs.rs/tracing/0.1.26/tracing/instrument/trait.Instrument.html#method.in_current_span">Read more</a></p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#541-552">source</a></span><a href="#impl-Into%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#549">source</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.From.html" title="From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#598-607">source</a></span><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="type trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#604">source</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'><p>Performs the conversion.</p>
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#583-592">source</a></span><a href="#impl-TryInto%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,&nbsp;</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="type trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.61.0/src/core/convert/mod.rs.html#589">source</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.61.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.61.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'><p>Performs the conversion.</p>
</div></details></div></details></div></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="abstio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.61.0 (fe5b13d68 2022-05-18)" ></div>
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