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Regex: use \A \z for subject start/end

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This is the most common syntax in various regex variants.
This commit is contained in:
Maxime Coste 2017-09-29 10:39:59 +08:00
parent 0bdfdac5c5
commit 7673781751
1 changed files with 2 additions and 4 deletions
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6
src/regex_impl.cc
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@ -125,8 +125,6 @@ private:
AstNodePtr res = new_node(op); AstNodePtr res = new_node(op);
while (auto node = term()) while (auto node = term())
res->children.push_back(std::move(node)); res->children.push_back(std::move(node));
if (res->children.empty())
parse_error("empty alternative");
return res; return res;
} }
@ -158,8 +156,8 @@ private:
{ {
case 'b': m_pos += 2; return new_node(ParsedRegex::WordBoundary); case 'b': m_pos += 2; return new_node(ParsedRegex::WordBoundary);
case 'B': m_pos += 2; return new_node(ParsedRegex::NotWordBoundary); case 'B': m_pos += 2; return new_node(ParsedRegex::NotWordBoundary);
case '`': m_pos += 2; return new_node(ParsedRegex::SubjectBegin); case 'A': m_pos += 2; return new_node(ParsedRegex::SubjectBegin);
case '\'': m_pos += 2; return new_node(ParsedRegex::SubjectEnd); case 'z': m_pos += 2; return new_node(ParsedRegex::SubjectEnd);
case 'K': m_pos += 2; return new_node(ParsedRegex::ResetStart); case 'K': m_pos += 2; return new_node(ParsedRegex::ResetStart);
} }
break; break;