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From: Michael Heerdegen <michael_heerdegen@web.de>
Newsgroups: gmane.emacs.help
Subject: Re: rx of (any SET...)
Date: Wed, 17 Aug 2022 23:37:00 +0200
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Michael Heerdegen <michael_heerdegen@web.de> writes:

> | (regexp EXPR) Match the string regexp from evaluating EXPR at run time.
>
> That's exactly what you are looking for...correct?

But ok, you have a string that contains a list of chars, so I too have
no better idea than

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

or to use the function instead:

  (rx-to-string `(not (any ,@mm-7bit-chars)))

What makes sense depends on the context.

Michael.