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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: Regexp to match any character, including newline?
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Martin Stone Davis <m0davis@pacbell.net> writes:

[rx.el]

> Is this documented anywhere?

I think the only mention is if you use `C-h p' (finder-by-keyword),
where it's listed under "Extensions".

> but it is not anywhere in the Elisp info files.

Maybe it should at least be mentioned in the regexp section of the
manual -- send a suggestion to bug-lisp-manual@gnu.org.

> I'm sure there are other gems like it in emacs

For regexps `M-x re-builder' is also very useful.