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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Ugly regexps
Date: Wed, 03 Mar 2021 08:00:57 +0200
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvk0qpjd31.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Tue, 02 Mar 2021 19:32:20 -0500)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 02 Mar 2021 19:32:20 -0500
> 
> So you can do
> 
>     (string-match (ere "\\(def(macro|un|subst) .{1,}"))
> 
> instead of
> 
>     (string-match "(def\\(macro\\|un\\|subst\\) .\\{1,\\}")

Why not use 'rx' in those cases?  IMO it makes the regexp even more
easy to write and read.