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From: Charles Sebold <csebold@livingtorah.org>
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Subject: Re: setting gnus-simplify-subject-functions for a single group?
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On 25 Shevat 5762, Steinar Bang wrote:

> Is it possible to set gnus-simplify-subject-functions for a single
> group?  Eg. in the Group Parameters of a group?

Yes, I've done it for several groups.  In my .gnus I have something like
this for the TRU-64 managers group (which has few "RE:" but lots of
"SUMMARY:" subject lines, and few people reply to their own queries so
threading doesn't work automagically):

(defun crs-gnus-simplify-subject-summary (subject)
  "Remove \"Summary:\" from subject lines."
  (if (string-match "[Ss][Uu][Mm]+[Aa][Rr][Yy]: " subject)
      (substring subject (match-end 0))
    subject))

And in the group parameters:

(gnus-simplify-subject-functions
  '(crs-gnus-simplify-subject-summary))

> Does anyone have a quick little function for removing a group tag from
> a subject, they'd like to share?

Not specifically, but you can probably get the idea from what I did
above.
-- 
Charles Sebold                                      25th of Shevat, 5762