--- a/mercurial/commands.py	Thu Sep 23 01:59:02 2010 +0200
+++ b/mercurial/commands.py	Thu Sep 23 10:59:21 2010 +0200
@@ -1585,7 +1585,7 @@
         reflags |= re.I
     try:
         regexp = re.compile(pattern, reflags)
-    except Exception, inst:
+    except re.error, inst:
         ui.warn(_("grep: invalid match pattern: %s\n") % inst)
         return 1
     sep, eol = ':', '\n'