From 8f2315888ea4294df11905b5308b200bf1b2d0f1 Mon Sep 17 00:00:00 2001
From: Crozzers <captaincrozzers@gmail.com>
Date: Mon, 2 Mar 2026 20:31:45 +0000
Subject: [PATCH] Fix #680

---
 lib/markdown2.py                                     | 5 ++---
 test/tm-cases/reference_link_lookalike_issue680.html | 1 +
 test/tm-cases/reference_link_lookalike_issue680.text | 1 +
 3 files changed, 4 insertions(+), 3 deletions(-)
 create mode 100644 test/tm-cases/reference_link_lookalike_issue680.html
 create mode 100644 test/tm-cases/reference_link_lookalike_issue680.text

diff --git a/lib/markdown2.py b/lib/markdown2.py
index 9b693530..16e5d50f 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -1460,7 +1460,7 @@ def _sanitize_html(self, s: str) -> str:
           [ ]?          # one optional space
           (?:\n[ ]*)?   # one optional newline followed by spaces
           \[
-            (?P<id>.*?)
+            (?P<id>[^\[\]]*?)
           \]
         ''', re.X | re.S)
 
@@ -3179,7 +3179,6 @@ def run(self, text: str):
                 start_idx = text.index('[', curr_pos)
             except ValueError:
                 break
-            text_length = len(text)
 
             # Find the matching closing ']'.
             # Markdown.pl allows *matching* brackets in link text so we
@@ -3190,7 +3189,7 @@ def run(self, text: str):
 
             for p in range(
                 start_idx + 1,
-                min(start_idx + MAX_LINK_TEXT_SENTINEL, text_length)
+                min(start_idx + MAX_LINK_TEXT_SENTINEL, len(text))
             ):
                 ch = text[p]
                 if ch == ']':
diff --git a/test/tm-cases/reference_link_lookalike_issue680.html b/test/tm-cases/reference_link_lookalike_issue680.html
new file mode 100644
index 00000000..182d8906
--- /dev/null
+++ b/test/tm-cases/reference_link_lookalike_issue680.html
@@ -0,0 +1 @@
+<p>[<a href="http://a.com">A</a>] [<a href="http://b.com">B</a>]</p>
diff --git a/test/tm-cases/reference_link_lookalike_issue680.text b/test/tm-cases/reference_link_lookalike_issue680.text
new file mode 100644
index 00000000..ad07eb9d
--- /dev/null
+++ b/test/tm-cases/reference_link_lookalike_issue680.text
@@ -0,0 +1 @@
+[[A](http://a.com)] [[B](http://b.com)]
\ No newline at end of file