diff -r ffcceca7406d -r 9a93f4fb141b mercurial/commands.py
--- a/mercurial/commands.py	Thu Sep 23 00:27:04 2010 -0600
+++ b/mercurial/commands.py	Wed Sep 22 19:15:27 2010 -0500
@@ -1569,7 +1569,7 @@
         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'