Fix get preview channel changes script

script/get-preview-channel-changes

@@ -2,8 +2,8 @@
 
 const { execFileSync } = require("child_process");
 const { GITHUB_ACCESS_TOKEN } = process.env;
-const PR_REGEX = /pull request #(\d+)/;
-const FIXES_REGEX = /(fixes|closes) (.+[/#]\d+.*)$/im;
+const PR_REGEX = /#\d+/ // Ex: matches on #4241
+const FIXES_REGEX = /(fixes|closes|completes) (.+[/#]\d+.*)$/im;
 
 main();
 
@@ -15,7 +15,7 @@ async function main() {
     { encoding: "utf8" }
   )
     .split("\n")
-    .filter((t) => t.startsWith("v") && t.endsWith('-pre'));
+    .filter((t) => t.startsWith("v") && t.endsWith("-pre"));
 
   // Print the previous release
   console.log(`Changes from ${oldTag} to ${newTag}\n`);
@@ -34,37 +34,11 @@ async function main() {
   }
 
   // Get the PRs merged between those two tags.
-  const pullRequestNumbers = execFileSync(
-    "git",
-    [
-      "log",
-      `${oldTag}..${newTag}`,
-      "--oneline",
-      "--grep",
-      "Merge pull request",
-    ],
-    { encoding: "utf8" }
-  )
-    .split("\n")
-    .filter((line) => line.length > 0)
-    .map((line) => line.match(PR_REGEX)[1]);
+  const pullRequestNumbers = getPullRequestNumbers(oldTag, newTag)
 
   // Get the PRs that were cherry-picked between main and the old tag.
-  const existingPullRequestNumbers = new Set(execFileSync(
-    "git",
-    [
-      "log",
-      `main..${oldTag}`,
-      "--oneline",
-      "--grep",
-      "Merge pull request",
-    ],
-    { encoding: "utf8" }
-  )
-    .split("\n")
-    .filter((line) => line.length > 0)
-    .map((line) => line.match(PR_REGEX)[1]));
-    
+  const existingPullRequestNumbers = new Set(getPullRequestNumbers("main", oldTag))
+
   // Filter out those existing PRs from the set of new PRs.
   const newPullRequestNumbers = pullRequestNumbers.filter(number => !existingPullRequestNumbers.has(number));
 
@@ -86,10 +60,39 @@ async function main() {
     console.log("  URL:    ", webURL);
 
     // If the pull request contains a 'closes' line, print the closed issue.
-    const fixesMatch = (pullRequest.body || '').match(FIXES_REGEX);
+    const fixesMatch = (pullRequest.body || "").match(FIXES_REGEX);
     if (fixesMatch) {
       const fixedIssueURL = fixesMatch[2];
       console.log("  Issue: ", fixedIssueURL);
     }
+
+    let releaseNotes = (pullRequest.body || "").split("Release Notes:")[1];
+
+    if (releaseNotes) {
+      releaseNotes = releaseNotes.trim()
+      console.log("  Release Notes:");
+      console.log(`    ${releaseNotes}`);
+    }
   }
 }
+
+function getPullRequestNumbers(oldTag, newTag) {
+  const pullRequestNumbers = execFileSync(
+    "git",
+    [
+      "log",
+      `${oldTag}..${newTag}`,
+      "--oneline"
+    ],
+    { encoding: "utf8" }
+  )
+    .split("\n")
+    .filter(line => line.length > 0)
+    .map(line => {
+      const match = line.match(/#(\d+)/);
+      return match ? match[1] : null;
+    })
+    .filter(line => line)
+
+  return pullRequestNumbers
+}