Fix replying to weird Re: variants

[Matt Armstrong <matt@lickey.com>]

It'd be cool if somebody with commit privileges would make this
change.

This patch against current CVS improves message.el's ability to strip
stupid variants of the "Re:" subject prefix.  I stole the relevant
portion of the regexp in gnus-simplify-subject that had to deal with
the same issue.

With this patch, you won't end up with a subject of

     "Re: Re[2]: whatever"

when replying to people that generate subjects like "Re[2]: whatever".

I know I could just customize this locally, but I'd like to make the
world a better place.  :-)


===================================================================
RCS file: /usr/local/cvsroot/gnus/lisp/message.el,v
retrieving revision 6.130
diff -u -r6.130 message.el
--- lisp/message.el	2001/10/16 12:55:17	6.130
+++ lisp/message.el	2001/10/19 03:41:25
@@ -223,7 +223,7 @@
   :group 'message-interface
   :type 'regexp)
 
-(defcustom message-subject-re-regexp "^[ \t]*\\([Rr][Ee]:[ \t]*\\)*[ \t]*"
+(defcustom message-subject-re-regexp "^[ \t]*\\([Rr][Ee]\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)*[ \t]*"
   "*Regexp matching \"Re: \" in the subject line."
   :group 'message-various
   :type 'regexp)