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Re: Transposing Regular Expression

From: jrwats
Subject: Re: Transposing Regular Expression
Date: Mon, 16 Nov 2009 08:28:08 -0800 (PST)
User-agent: G2/1.0

> IIUC you are going to change strings.
> That's a simple task then with no need to employ
> \# for the number match ore other advanced features.
> Interactivly just call
> M-x query-replace - putting in your strings at the prompt.
> From a program use for example
> (while
>   (search-forward "abc" nil t 1)
>   (replace-match "xyz"))
That's not exactly what I'm looking for as I really need 2 words/
characters to be swapped.  For instance, swapping "true" and "false"
in a region.  Replacing all the "true"s with "false"s will yield a 1/2
correct answer but there's no way to replace the old false's anymore.
LanX's solution appears to do the correct thing regarding an actual
Perl-style transpose, and seeems like it could easily be altered to
work on a region.  The quickest solution for the simple 2-way swap was
definitely the back reference (example provided by harven).

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