Fix caption parsing

For microsoft#79704

- Use regexp
- Handle unix line endings
- Don't highlight caption as part of code block

extensions/typescript-language-features/src/utils/previewer.ts

@@ -11,19 +11,26 @@ function getTagBodyText(tag: Proto.JSDocTagInfo): string | undefined {
 		return undefined;
 	}
 
+	// Convert to markdown code block if it is not already one
+	function makeCodeblock(text: string): string {
+		if (text.match(/^\s*[~`]{3}/g)) {
+			return text;
+		}
+		return '```\n' + text + '\n```';
+	}
+
 	switch (tag.name) {
 		case 'example':
 			// check for caption tags, fix for #79704
-			const captionTagMatches = tag.text.match('<caption>(.*?)<\/caption>\r');
+			const captionTagMatches = tag.text.match(/<caption>(.*?)<\/caption>\s*(\r\n|\n)/);
 			if (captionTagMatches && captionTagMatches.index === 0) {
-				tag.text = captionTagMatches[1] + '\r\r' + tag.text.substr(captionTagMatches[0].length);
+				return captionTagMatches[1] + '\n\n' + makeCodeblock(tag.text.substr(captionTagMatches[0].length));
+			} else {
+				return makeCodeblock(tag.text);
 			}
+
 		case 'default':
-			// Convert to markdown code block if it is not already one
-			if (tag.text.match(/^\s*[~`]{3}/g)) {
-				return tag.text;
-			}
-			return '```\n' + tag.text + '\n```';
+			return makeCodeblock(tag.text);
 	}
 
 	return tag.text;