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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: [PATCH] Re: Make peg.el a built-in library?
Date: Wed, 11 Jan 2023 12:01:43 +0100
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Ihor Radchenko <yantar92@posteo.net> writes:

> I am wondering if we may instead just support traditional regexps as an
> extra PEG construct. Considering that regexp support is anyway built-in,
> why not?

Dunno.  I wrote the translator for academic interest and for
learning.

AFAIR not all Emacs regexp features work in PEGs - backrefs for example.
Or match data handling.

Michael.