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From: Dave Love <d.love@dl.ac.uk>
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Subject: Re: need to recognize non-ASCII identifiers
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Martin Stjernholm <mast@lysator.liu.se> writes:

> Even in other versions there's the possibility to use \sw etc.

Yes, but that's even less useful for non-ASCII text, which is why we
needed the POSIX char classes.

> The problem has been that there's no character class that matches
> all alphabetic characters but not the digits. However, you mentioned
> [:alpha:] which would presumably do just that.

Yes.

> You said it works in Emacs 21, but I haven't been able to find any doc
> on these new character classes in the manual for Emacs 21.2. Where can
> I read about it?

Info node `Char Classes' or regex(7).