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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Hiding files in dired ?
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 (message from David Masterson on Wed, 17 Nov 2021 20:16:47 -0800)
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> From: David Masterson <dsmasterson92630@outlook.com>
> Date: Wed, 17 Nov 2021 20:16:47 -0800
> 
> Side question: where is the syntax for Emacs regexp documented?

In the manuals, of course.  Each one of the two manuals has a chapter
which documents that.