From: Anselm Helbig <anselm.helbig+news2009@googlemail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: regular expression for hiding comment
Date: Thu, 07 May 2009 16:19:43 +0200 [thread overview]
Message-ID: <87bpq5j8qo.wl%anselm.helbig+news2009@googlemail.com> (raw)
In-Reply-To: <d60d4b40-55ab-4b43-87bd-14d97daa024c@s16g2000vbp.googlegroups.com>
Hi!
> I need a regexp which show all line execpt lines which include the
> string "--" (the qoute is not part of the sign).
Generally, RegExps suck at "negative matching". You'd rather have a
regexp match all lines that are comments and then do something to the
other lines. There's M-x flush-lines for example, and M-x grep calls
out to the external grep program that has the `-v'-switch.
It might be possible to construct a regex that does what you want.
Unfortunately, this isn't so easy and Peter's solution is definitely
wrong - it matches any line that contains two adjacent non-dash
characters. I don't have a quick answer to that one neither - nice
brain teaser. 8-)
HTH,
Anselm
--
Anselm Helbig
mailto:anselm.helbig+news2009@googlemail.com
next prev parent reply other threads:[~2009-05-07 14:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-07 6:44 regular expression for hiding comment tomer
2009-05-07 8:20 ` Peter Dyballa
[not found] ` <mailman.6787.1241684779.31690.help-gnu-emacs@gnu.org>
2009-05-07 8:54 ` tomer
2009-05-07 12:07 ` Pascal J. Bourguignon
2009-05-07 13:31 ` tomer
2009-05-07 14:19 ` Anselm Helbig [this message]
2009-05-07 14:32 ` Drew Adams
2009-05-07 16:07 ` Pascal J. Bourguignon
2009-05-07 16:21 ` tomer
2009-05-07 19:12 ` Peter Dyballa
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