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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: What is the use of "categories"?
Date: Thu, 30 Aug 2018 16:12:34 +0300
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> From: John Shahid <jvshahid@gmail.com>
> Cc: help-gnu-emacs@gnu.org
> Date: Wed, 29 Aug 2018 22:47:02 -0400
> 
> > You can use categories in regular expressions, via the \c escape.
> > This could allow you, for example, to find Katakana characters, or
> > characters that are consonants.
> 
> Should the Elisp manual be updated to link to `Emacs (Regexp Backslack)' ?

It should be the other way around, and that link already exists.