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From: Giorgos Keramidas <keramida@ceid.upatras.gr>
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Subject: Re: replace-regexp question
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David Kastrup <dak@gnu.org> writes:
>Neon Absentius <absent@sdf.lonestar.org> writes:
>> 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.
>
> The development version of Emacs would offer
> C-M-% -?[0-9]+ RET \,(+ \#& 15) RET

Oh, heh!  Very neat ;)