From 85eb54ff17da26327399bf188f9ff9b8fd515278 Mon Sep 17 00:00:00 2001
From: Hsiaoming Yang <me@lepture.com>
Date: Mon, 16 Mar 2026 22:00:29 +0900
Subject: [PATCH] fix: update link reference

---
 src/mistune/helpers.py   | 4 ++--
 tests/test_commonmark.py | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/mistune/helpers.py b/src/mistune/helpers.py
index 5fb424c..90ad587 100644
--- a/src/mistune/helpers.py
+++ b/src/mistune/helpers.py
@@ -19,8 +19,8 @@
 
 LINK_TITLE_RE = re.compile(
     r"[ \t\n]+("
-    r'"(?:\\' + PUNCTUATION + r'|[^"\x00])*"|'  # "title"
-    r"'(?:\\" + PUNCTUATION + r"|[^'\x00])*'"  # 'title'
+    r'"(?:\\' + PUNCTUATION + r'|[^"\\\x00])*"|'
+    r"'(?:\\" + PUNCTUATION + r"|[^'\\\x00])*'"
     r")"
 )
 PAREN_END_RE = re.compile(r"\s*\)")
diff --git a/tests/test_commonmark.py b/tests/test_commonmark.py
index 459bb6b..e372461 100644
--- a/tests/test_commonmark.py
+++ b/tests/test_commonmark.py
@@ -18,6 +18,7 @@
     # we don't support link title in (title)
     "links_496",
     "links_504",
+    "link_reference_definitions_202",
     # we don't support flanking delimiter run
     "emphasis_and_strong_emphasis_352",
     "emphasis_and_strong_emphasis_367",
