From mboxrd@z Thu Jan  1 00:00:00 1970
Path: main.gmane.org!not-for-mail
From: Alan Mackenzie<none@example.invalid>
Newsgroups: gmane.emacs.help
Subject: Re: silly regexp-replace question: how to delete empty lines
Date: Thu, 4 Mar 2004 10:10:35 +0000
Organization: muc.de e.V. -- private internet access
Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Message-ID: <rav62c.7g.ln@acm.acm>
References: <c23bnr$1u62$1@otis.netspace.net.au> <uy8qhy9lp.fsf@swbell.net>
	<c25r54$2qsq$1@otis.netspace.net.au>
	<yoiju115cs9c.fsf@frealaf.dd.chalmers.se>
NNTP-Posting-Host: deer.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: sea.gmane.org 1078671685 7218 80.91.224.253 (7 Mar 2004 15:01:25 GMT)
X-Complaints-To: usenet@sea.gmane.org
NNTP-Posting-Date: Sun, 7 Mar 2004 15:01:25 +0000 (UTC)
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Mar 07 16:01:15 2004
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Original-Received: from monty-python.gnu.org ([199.232.76.173])
	by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian))
	id 1AzzmF-0004T2-00
	for <geh-help-gnu-emacs@m.gmane.org>; Sun, 07 Mar 2004 16:01:15 +0100
Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org)
	by monty-python.gnu.org with esmtp (Exim 4.30)
	id 1Azzko-0007IT-1x
	for geh-help-gnu-emacs@m.gmane.org; Sun, 07 Mar 2004 09:59:46 -0500
Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!headwall.stanford.edu!news.ks.uiuc.edu!news.glorb.com!newsfeed.stueberl.de!news.space.net!news.muc.de!not-for-mail
Original-Newsgroups: gnu.emacs.help
Original-Lines: 27
Original-NNTP-Posting-Host: acm.muc.de
Original-X-Trace: marvin.muc.de 1078407748 57772 193.149.49.134 (4 Mar 2004 13:42:28
	GMT)
Original-X-Complaints-To: news-admin@muc.de
Original-NNTP-Posting-Date: 4 Mar 2004 13:42:28 GMT
User-Agent: tin/1.4.5-20010409 ("One More Nightmare") (UNIX) (Linux/2.0.35
	(i686))
Original-Xref: shelby.stanford.edu gnu.emacs.help:121462
Original-To: help-gnu-emacs@gnu.org
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.2
Precedence: list
List-Id: Users list for the GNU Emacs text editor  <help-gnu-emacs.gnu.org>
List-Unsubscribe: <http://mail.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://mail.gnu.org/pipermail/help-gnu-emacs>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <http://mail.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Xref: main.gmane.org gmane.emacs.help:17444
X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:17444

Johan Bockgård <bojohan+news@dd.chalmers.se> wrote on Thu, 04 Mar 2004
02:31:27 +0100:
> "leo" <halloleo@noospaam.myrealbox.com> writes:

>> now i recall: i guess, the fact that "^[C-j]" works but "^$[C-j]"
>> doesn't, is kind of a regexp bug/feature in emacs, isn't it?

>     For historical compatibility reasons, `$' can be used only at the
>     end of the regular expression, or before `\)' or `\|'.

>     For historical compatibility reasons, `^' can be used only at the
>     beginning of the regular expression, or after `\(' or `\|'.

> (info "(elisp)Regexp Special")

Yes, it's a pain in the backside.  But leo could write his regexp thus:

"^\\($\\)[C-j]".

> -- 
> Johan Bockgård

-- 
Alan Mackenzie (Munich, Germany)
Email: aacm@muuc.dee; to decode, wherever there is a repeated letter
(like "aa"), remove half of them (leaving, say, "a").