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replace-regexp question

From: Neon Absentius
Subject: replace-regexp question
Date: Wed, 26 Oct 2005 17:15:57 +0000
User-agent: Mutt/

Is there a way to use the command replace-regexp to replace a number with 
that number increased, say, by 15?  I tried 

C-M-% -?[0-9]+ RET (number-to-string (+ (string-to-number "\&") 15)) RET

but it doesn't work because emacs interprets the second input to be a string 
and so it doesn't evaluate it.  So I guess the question is how can we use
the result of evaluating a sexp for replacement text?

Any help and/or pointers to documentation will be greatly appreciated. 

 There is no national science just as there is no national
multiplication table; what is national is no longer science.
         -- Anton Checov

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