From: Kevin Rodgers <kevin.d.rodgers@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: does emacs regular expression support (?!expression)
Date: Thu, 02 Feb 2012 17:37:57 -0700 [thread overview]
Message-ID: <jgfa7c$76h$1@dough.gmane.org> (raw)
In-Reply-To: <87ipjo52qn.fsf@thinkpad.tsdh.de>
On 2/2/12 2:45 PM, Tassilo Horn wrote:
> Tim Landscheidt<tim@tim-landscheidt.de> writes:
>> 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.
IIUC, the Perl regex would successfully match "foo" if it were followed by
"far", but the Emacs regexp would not.
Maybe \(?:[^b][^a][^r]\) should be \(?:[^b]\|b[^a]\|ba[^r]\)
--
Kevin Rodgers
Denver, Colorado, USA
next prev parent reply other threads:[~2012-02-03 0:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 14:02 does emacs regular expression support (?!expression) 土星五号
2012-02-02 18:56 ` Tassilo Horn
2012-02-02 21:14 ` Tim Landscheidt
2012-02-02 21:45 ` Tassilo Horn
2012-02-02 22:11 ` Tim Landscheidt
2012-02-02 22:17 ` Tim Landscheidt
2012-02-03 0:37 ` Kevin Rodgers [this message]
2012-02-03 2:12 ` 土星五号
2012-02-03 8:30 ` Thien-Thi Nguyen
2012-02-03 11:17 ` Tim Landscheidt
2012-02-03 11:48 ` Thien-Thi Nguyen
2012-02-04 10:12 ` Tim Landscheidt
2012-02-04 12:16 ` 土星五号
2012-02-04 15:26 ` Thien-Thi Nguyen
2012-02-05 11:57 ` Tim Landscheidt
2012-02-02 22:09 ` Glenn Morris
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