trentm · nicholasserra · Jan 20, 2026 · Jan 18, 2026
diff --git a/lib/markdown2.py b/lib/markdown2.py
@@ -1655,7 +1655,7 @@ def _h_tag_sub(self, match: re.Match[str]) -> str:
         text = match.string[match.start(): match.end()]
         h_level = int(match.group(1))
         # extract id= attr from tag, trying to account for regex "misses"
-        id_attr = (re.match(r'.*?id=(\S+)?.*', match.group(2) or '') or '')
+        id_attr = (re.match(r'.*?id="(\S+)?".*', match.group(2) or '') or '')
         if id_attr:
             # if id attr exists, extract that
             id_attr = id_attr.group(1) or ''

diff --git a/test/tm-cases/toc_with_inline_code.html b/test/tm-cases/toc_with_inline_code.html
@@ -0,0 +1 @@
+<h1 id="bla"><code>bla</code></h1>
diff --git a/test/tm-cases/toc_with_inline_code.opts b/test/tm-cases/toc_with_inline_code.opts
@@ -0,0 +1 @@
+{"extras": {"toc": {"depth": 1}, "header-ids": {"mixed": True }}}
diff --git a/test/tm-cases/toc_with_inline_code.tags b/test/tm-cases/toc_with_inline_code.tags
@@ -0,0 +1 @@
+toc extra issue675
diff --git a/test/tm-cases/toc_with_inline_code.text b/test/tm-cases/toc_with_inline_code.text
@@ -0,0 +1 @@
+# `bla`
diff --git a/test/tm-cases/toc_with_inline_code.toc_html b/test/tm-cases/toc_with_inline_code.toc_html
@@ -0,0 +1,3 @@
+<ul>
+  <li><a href="#bla"><code>bla</code></a></li>
+</ul>
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		{"extras": {"toc": {"depth": 1}, "header-ids": {"mixed": True }}}