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Re: Using unicode labels with spaces in RefTex

From: Arash Esbati
Subject: Re: Using unicode labels with spaces in RefTex
Date: Mon, 04 Jan 2021 17:51:17 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50

Hi Marcin,

Marcin Kolenda <> writes:

> I am using AUCTeX for typesetting mathematics in English and Polish
> language.
> When I interactively call #'reftex-label and put space inside the label or
> an character commonly used in polish like ą ę ł ó ź ć ż I get message that
> it contains invalid characters.
> However, I successfully use the labels with spaces or utf8 characters
> without an issue. I am tempted to remove the aforementioned check for label
> characters domain. Why shouldn't I do that?

The only reason for sticking with ASCII characters is portability, in my

Not tested, but you can lift the restriction in RefTeX by customizing
the variable `reftex-label-illegal-re'.  Something like this should do
the job:

    (setq reftex-label-illegal-re

Best, Arash

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