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From: Michael Heerdegen <michael_heerdegen@web.de>
Newsgroups: gmane.emacs.help
Subject: Re: rx of (any SET...)
Date: Thu, 18 Aug 2022 02:59:16 +0200
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Michael Heerdegen <michael_heerdegen@web.de> writes:

> (rx (regexp (concat "[^" (bound-and-true-p mm-7bit-chars) "]")))

Even using `rx-define' is not so helpful (its expanding mechanism is
different from e.g. defmacro):

#+begin_src emacs-lisp
  (rx-define any-char (&rest string) (regex (concat "[" string "]")))
  (rx-define not-any-char (&rest string) (regex (concat "[^" string "]")))
#+end_src

Will not work inside `not'.  Thus two definitions.

Ok, in the end I could not really help at all...

Michael.