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Re: rx of (any SET...)

From: Harald Jörg
Subject: Re: rx of (any SET...)
Date: Wed, 17 Aug 2022 20:42:36 +0000

Michael Albinus writes:

> Hi,
> I have the regexp
> (concat "[^" (bound-and-true-p mm-7bit-chars) "]")
> I want to write it in rx notation, but I fail. I know how to use xr for
> reverse engineering, but I'd like to keep the variable mm-7bit-chars in
> the rx notation, and not to replace it by the literal string.
> How would this look like?

I found that variables can be included in rx forms with some form of
eval, or by using rx-to-string, which is a function and not a macro.

With the value of mm-7bit-chars at macro expansion time:
(rx (eval `(not (any ,mm-7bit-chars))))

With the value of mm-7bit-chars at runtime:
(eval `(rx (not (any ,mm-7bit-chars))))
(rx-to-string `(not (any ,mm-7bit-chars)))


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