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Re: does emacs regular expression support (?!expression)
From: |
Tim Landscheidt |
Subject: |
Re: does emacs regular expression support (?!expression) |
Date: |
Thu, 02 Feb 2012 22:11:27 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) |
Tassilo Horn <tassilo@member.fsf.org> wrote:
> [...]
>>> matches "foo19" or "bar23", but doesn't capture foo or bar, so that
>>> (match-string 1) is the number.
>> In Perl, "(?!pattern)" is a zero-width negative look-ahead
>> assertion. Emacs does not support these AFAIK.
> I see. So when you do /foo(?!bar)/ in Perl, you'd need to do
> "foo\\(?:[^b][^a][^r]\\)" in elisp.
You have to account for possible end-of-buffer as well so
usually it's "easier" to use two matches ('(while (and
(search-forward-regexp "foo") (not (looking-at "bar"))))'
(untested)) - that's why I (still :-)) think these features
should be implemented in Emacs as well.
Tim
- does emacs regular expression support (?!expression), 土星五号, 2012/02/02
- Re: does emacs regular expression support (?!expression), Tassilo Horn, 2012/02/02
- Re: does emacs regular expression support (?!expression), Tim Landscheidt, 2012/02/02
- Re: does emacs regular expression support (?!expression), Kevin Rodgers, 2012/02/02
- Re: does emacs regular expression support (?!expression), 土星五号, 2012/02/02
- Re: does emacs regular expression support (?!expression), Thien-Thi Nguyen, 2012/02/03
- Re: does emacs regular expression support (?!expression), Tim Landscheidt, 2012/02/03
- Re: does emacs regular expression support (?!expression), Thien-Thi Nguyen, 2012/02/03
- Re: does emacs regular expression support (?!expression), Tim Landscheidt, 2012/02/04
- Re: does emacs regular expression support (?!expression), 土星五号, 2012/02/04
- Re: does emacs regular expression support (?!expression), Thien-Thi Nguyen, 2012/02/04
- Re: does emacs regular expression support (?!expression), Tim Landscheidt, 2012/02/05