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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 21:20:19 +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 18:07:33 +0000)
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> From: Drew Adams <drew.adams@oracle.com>
> CC: "ofv@wanadoo.es" <ofv@wanadoo.es>,
>         "emacs-devel@gnu.org"
> 	<emacs-devel@gnu.org>
> Date: Tue, 1 Jun 2021 18:07:33 +0000
> 
> But yes, hi-lock.el offers some improvement over
> the hard-coded behavior of `nobreak-char-display'
> and `whitespace-mode'.

How do you write a regexp or a character class that matches characters
which cannot be encoded by a given coding-system?