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Re: Ugly regexps

From: Lars Ingebrigtsen
Subject: Re: Ugly regexps
Date: Wed, 03 Mar 2021 14:57:12 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> So you can do
>     (string-match (ere "\\(def(macro|un|subst) .{1,}"))
> instead of
>     (string-match "(def\\(macro\\|un\\|subst\\) .\\{1,\\}")
> ?

Sounds good to me.  In some cases, introducing an alternative syntax can
create confusion, but I don't think that's really the case here -- I
think everybody knows this syntax, perhaps better than the Emacs regexp

The byte compiler can do the transformation, I guess?  (When it's a
string literal, which is usually is.)  So there should be no performance
impact.  And when Emacs finally grows support for a regexp object, then
`ere' can return one of those.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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