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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: How to grep for a string spanning multiple lines?
Date: Sun, 27 Nov 2022 08:31:15 +0100
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Jean Louis <bugs@gnu.support> writes:

> It means it is not to be used to search for new lines in program, as
> programs may not have syntax tables.
>
> Then this is solution:
>
> (rx (one-or-more (or "\n" (any whitespace)))) ➜ "\\(?:
> \\|[[:space:]]\\)+"

`rx' has a keyword to mach any char (including whitespace), it's
called `anychar'.

Michael.