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From: Carl <c.groner@gmail.com>
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Subject: Re: regular expression package
Date: Mon, 07 Apr 2008 15:23:53 -0700
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David Roderick <angel_ov_north@tiscali.co.uk> writes:

> Somebody wrote a package where you can do type a regular expression in
> one buffer on some text in another, and see the results ins a 3rd
> what is this package called and where can I get it?
>

M-x re-builder

http://www.emacswiki.org/cgi-bin/wiki/ReBuilder

HTH,