--- a/mercurial/hgweb/webutil.py	Tue Jun 26 10:33:52 2018 -0400
+++ b/mercurial/hgweb/webutil.py	Tue Jun 26 10:36:23 2018 -0400
@@ -766,7 +766,7 @@
     for key, pattern in websubdefs:
         # grab the delimiter from the character after the "s"
         unesc = pattern[1:2]
-        delim = re.escape(unesc)
+        delim = stringutil.reescape(unesc)
 
         # identify portions of the pattern, taking care to avoid escaped
         # delimiters. the replace format and flags are optional, but