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Re: [O] Possible regexp bug in org.el
From: |
Nicolas Richard |
Subject: |
Re: [O] Possible regexp bug in org.el |
Date: |
Tue, 01 Apr 2014 12:16:49 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
Thorsten Jolitz <address@hidden> writes:
> here is a possible regexp bug in org.el I discovered by accident:
>
> ,---------------------------------------------
> | 7734: (and (not (looking-back "^\*+"))
> `---------------------------------------------
It's almost certainly a typo, but it introduces no bug because '*' can't
bear its special meaning after '^', so the regexp engine will make it
match exactly the '*' character. But it'd be better written as "^*+"
(but this is not recommended) or, preferably, "^\\*+" indeed.
Here's the relevant manual excerpt from (info "(elisp) Regexp Special") :
> *Please note:* For historical compatibility, special characters are
> treated as ordinary ones if they are in contexts where their special
> meanings make no sense. For example, `*foo' treats `*' as ordinary
> since there is no preceding expression on which the `*' can act. It is
> poor practice to depend on this behavior; quote the special character
> anyway, regardless of where it appears.
--
Nico.