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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [External] : Re: minor mode for highlighting character classes
 such as non-ascii (bug 47455)
Date: Tue, 01 Jun 2021 19:53:04 +0300
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To: Drew Adams <drew.adams@oracle.com>
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 (message from Drew Adams on Tue, 1 Jun 2021 16:49:21 +0000)
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> From: Drew Adams <drew.adams@oracle.com>
> Date: Tue, 1 Jun 2021 16:49:21 +0000
> 
> More useful is something like what library `highlight-chars.el'
> offers.  You can highlight any chars you like, in any way you
> like.  You can highlight arbitrary chars, chars in char ranges,
> char classes, or charsets.

You mean, like highlight-regexp?