GNU bug report logs - #36167
[PATCH] Replace manually crafted hex regexes with [[:xdigit:]]

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Message #89 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andy Moreton <andrewjmoreton <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#36167: [PATCH] Replace manually crafted hex regexes with
 [[:xdigit:]]
Date: Wed, 12 Jun 2019 12:44:12 +0100

On Wed 12 Jun 2019, Eli Zaretskii wrote:

>> From: Andy Moreton <andrewjmoreton <at> gmail.com>
>> Date: Tue, 11 Jun 2019 20:56:09 +0100
>> 
>> The docs for [:digit:] and [:xdigit:] seem clear enough, but there is
>> one other minor point that could be clarified.
>> 
>> The [:alnum:] and [:alpha:] are based on (unspecified values of) the Unicode
>> general-category property, but [:digit:] is not. Thus [:alnum:] includes
>> other numeric characters that are not matched by [:digit:].
>
> It's true that [:alnum:] includes more numerical characters that
> [:digit:], but what exactly needs to be clarified here?  Assuming you
> mean clarified in the manual, that is.

As noted by Paul Eggert, the POSIX behaviour is different. It may be
worth a note in the manual to draw attention to this difference.

    AndyM

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