fix: allow escaped newline in link text (#3752)

UziTech · web-flow · commit 30c66301f926 · 2025-08-27T09:02:21.000-04:00
* fix: allow ecaped newline in link text

* use [\s\S]
diff --git a/src/rules.ts b/src/rules.ts
@@ -106,7 +106,7 @@ const lheadingGfm = edit(lheadingCore)
   .getRegex();
 const _paragraph = /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html|table| +\n)[^\n]+)*)/;
 const blockText = /^[^\n]+/;
-const _blockLabel = /(?!\s*\])(?:\\.|[^\[\]\\])+/;
+const _blockLabel = /(?!\s*\])(?:\\[\s\S]|[^\[\]\\])+/;
 const def = edit(/^ {0,3}\[(label)\]: *(?:\n[ \t]*)?([^<\s][^\s]*|<.*?>)(?:(?: +(?:\n[ \t]*)?| *\n[ \t]*)(title))? *(?:\n+|$)/)
   .replace('label', _blockLabel)
   .replace('title', /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/)
@@ -267,7 +267,7 @@ const _punctuationOrSpaceGfmStrongEm = /(?!~)[\s\p{P}\p{S}]/u;
 const _notPunctuationOrSpaceGfmStrongEm = /(?:[^\s\p{P}\p{S}]|~)/u;
 
 // sequences em should skip over [title](link), `code`, <html>
-const blockSkip = /\[[^[\]]*?\]\((?:\\.|[^\\\(\)]|\((?:\\.|[^\\\(\)])*\))*\)|`[^`]*?`|<(?! )[^<>]*?>/g;
+const blockSkip = /\[[^\[\]]*?\]\((?:\\[\s\S]|[^\\\(\)]|\((?:\\[\s\S]|[^\\\(\)])*\))*\)|`[^`]*?`|<(?! )[^<>]*?>/g;
 
 const emStrongLDelimCore = /^(?:\*+(?:((?!\*)punct)|[^\s*]))|^_+(?:((?!_)punct)|([^\s_]))/;
 
@@ -336,7 +336,7 @@ const tag = edit(
   .replace('attribute', /\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/)
   .getRegex();
 
-const _inlineLabel = /(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/;
+const _inlineLabel = /(?:\[(?:\\[\s\S]|[^\[\]\\])*\]|\\[\s\S]|`[^`]*`|[^\[\]\\`])*?/;
 
 const link = edit(/^!?\[(label)\]\(\s*(href)(?:(?:[ \t]*(?:\n[ \t]*)?)(title))?\s*\)/)
   .replace('label', _inlineLabel)
@@ -412,7 +412,7 @@ const inlineGfm: Record<InlineKeys, RegExp> = {
     .replace('email', /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/)
     .getRegex(),
   _backpedal: /(?:[^?!.,:;*_'"~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_'"~)]+(?!$))+/,
-  del: /^(~~?)(?=[^\s~])((?:\\.|[^\\])*?(?:\\.|[^\s~\\]))\1(?=[^~]|$)/,
+  del: /^(~~?)(?=[^\s~])((?:\\[\s\S]|[^\\])*?(?:\\[\s\S]|[^\s~\\]))\1(?=[^~]|$)/,
   text: /^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/,
 };
 
diff --git a/test/specs/new/escape_newline.html b/test/specs/new/escape_newline.html
@@ -0,0 +1,14 @@
+<p>
+  <a href="https://example.com">foo<br />
+bar</a>
+</p>
+
+<p>
+  <a href="https://example2.com">foo2<br />
+bar2</a>
+</p>
+
+<p>
+  <a href="https://example.com">foo3<br />
+bar3</a>
+</p>
diff --git a/test/specs/new/escape_newline.md b/test/specs/new/escape_newline.md
@@ -0,0 +1,12 @@
+[foo\
+bar]
+
+[foo\
+bar]: https://example.com
+
+[foo2\
+bar2](https://example2.com)
+
+[foo3\
+bar3][foo\
+bar]
