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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 22:17:04 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) |
I 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)) - [...]
Eh, yes, there is an "(untested)", but still the logic is
obviously plain wrong. But you get the idea.
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
- Re: does emacs regular expression support (?!expression), Glenn Morris, 2012/02/02