GNU bug report logs - #10649
23.4; Regexp char classes not working

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From: Raffaele Ricciardi <rfflrccrd <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 10649 <at> debbugs.gnu.org
Subject: bug#10649: 23.4; Regexp char classes not working
Date: Tue, 31 Jan 2012 20:47:52 +0000

Ouch!  I did RTFM, but the brackets confused me.  Thank you.
--

On 01/30/2012 08:06 AM, Glenn Morris wrote:
> Raffaele Ricciardi wrote:
>
>> - start emacs -Q
>> - evaluate this forms:
>> (string-match "[:xdigit:]" "0")
>> (string-match "[:xdigit:]" "a")
>> (string-match "[:alnum:]" "5")
>> They should return non-nil, but they return nil instead.
>
>  From the elisp manual:
>
> 34.3.1.2 Character Classes
>
> Here is a table of the classes you can use in a character alternative,
>                                              ^^^^^^^^^^^^^^^^^^^^^^^^^
>
> 34.3.1.1 Special Characters in Regular Expressions
> [...]
> `[ ... ]'
>       is a "character alternative", which begins with `[' and is
>       terminated by `]'
>
> Therefore you must write eg
>
>    (string-match "[[:xdigit:]]" "0")

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