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Re: How modify numbers in a region by a multiplier?


From: David Kastrup
Subject: Re: How modify numbers in a region by a multiplier?
Date: Wed, 08 Dec 2010 15:16:57 -0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Seweryn Kokot <sewkokot@gmail.com> writes:

> Juanma Barranquero <lekktu <at> gmail.com> writes:
>
>> Qiang Guo is right, though, in pointing that you're using a fixed
>> `end' but the buffer or region length is potentially changing with
>> every replace.
>
> Is there a canonical solution to this problem, since it seems that it should
> happen frequently when using the following structure: 
> (while (re-search-forward "\\([0-9.]+\\)" end t)
> (replace-match (format "%.2f" (* (string-to-number (match-string 1))
> multiplier))))

Probably easiest to do

(save-restriction
  (narrow-to-region start end
     ...

-- 
David Kastrup


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