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From: Nicolas Richard <youngfrog@members.fsf.org>
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Subject: Re: A variant of match-end, but after replacement?
Date: Mon, 20 Jul 2015 12:46:22 +0200
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To: Marcin Borkowski <mbork@mbork.pl>
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Marcin Borkowski <mbork@mbork.pl> writes:
> Nope - I'm doing search and replacement in a string, not in a buffer...

you could do:
   (with-temp-buffer
     (insert string)
     do-magic-here
     (buffer-string))

-- 
Nico.