diff -r 7132c780c686 roundup/cgi/templating.py
--- a/roundup/cgi/templating.py	Sun Nov 15 15:17:10 2020 -0500
+++ b/roundup/cgi/templating.py	Sun Nov 22 15:48:00 2020 +0100
@@ -1686,7 +1686,7 @@
                                 ('(', ')'),
                                 }:
                             continue
-                    if prefix == '(' and match.string[end - 1] == ')':
+                    if prefix == '(' and ')' in match.group(group):
                         continue
                 s = match.group(group)
                 return '<%s>' % s
diff -r 7132c780c686 test/test_templating.py
--- a/test/test_templating.py	Sun Nov 15 15:17:10 2020 -0500
+++ b/test/test_templating.py	Sun Nov 22 15:48:00 2020 +0100
@@ -566,6 +566,11 @@
         m = self.mangleMarkdown2(m)
         self.assertEqual(m.rstrip('\n'), '<p><a href="http://example.com/" rel="nofollow noopener" title="a title">label</a></p>')
 
+        p = StringHTMLProperty(self.client, 'test', '1', None, 'test', u2s(u'[label](http://example.com/).'))
+        m = p.markdown(hyperlink=1)
+        m = self.mangleMarkdown2(m)
+        self.assertEqual(m.rstrip('\n'), '<p><a href="http://example.com/" rel="nofollow noopener">label</a>.</p>')
+
         p = StringHTMLProperty(self.client, 'test', '1', None, 'test', u2s(u'![](http://example.com/)'))
         m = p.markdown(hyperlink=1)
         m = self.mangleMarkdown2(m)