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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: regex question
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upro <upro@gmx.net> writes:

> I want to use M-x replace-regexp like this
>
> s/[a-z]''/$1"/g

I'm not sure what this means, but I assume you want to replace stuff
like a'' with a".

> the first part [a-z]'' works, but then the mathed lowercase letter is
> not reinserted, but a litteral $1.
>
> How does that work in emacs-regex? I don't find the relevant info in
> the info file...

You could do:

   `M-x replace-regexp RET \([a-z]\)'' RET \1" RET'

Regexp syntax in Emacs is described in <info://emacs/Regexps>.