Index: trac/mimeview/api.py
===================================================================
--- trac/mimeview/api.py	(revision 2824)
+++ trac/mimeview/api.py	(working copy)
@@ -331,7 +331,7 @@
 def _html_splitlines(lines):
     """Tracks open and close tags in lines of HTML text and yields lines that
     have no tags spanning more than one line."""
-    open_tag_re = re.compile(r'<(\w+)(\s.*)?[^/]?>')
+    open_tag_re = re.compile(r'<(\w+)(\s.*?)[^/]?>')
     close_tag_re = re.compile(r'</(\w+)>')
     open_tags = []
     for line in lines: