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bug#10649: 23.4; Regexp char classes not working
From: |
Glenn Morris |
Subject: |
bug#10649: 23.4; Regexp char classes not working |
Date: |
Mon, 30 Jan 2012 03:06:43 -0500 |
User-agent: |
Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) |
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")