From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: tomas@tuxteam.de Newsgroups: gmane.emacs.help Subject: Re: Use the characters "+" and "-" in regular expressions Date: Wed, 19 May 2021 21:10:30 +0200 Message-ID: <20210519191030.GA4855@tuxteam.de> References: <20210519162745.GJ7028@tuxteam.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="azLHFNyN32YCQGCU" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18277"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/1.5.21 (2010-09-15) Cc: Help Gnu Emacs , steve-humphreys@gmx.com To: Skip Montanaro Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed May 19 21:36:39 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ljRzj-0004ZJ-Hr for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 19 May 2021 21:36:39 +0200 Original-Received: from localhost ([::1]:35228 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ljRzh-0005Hg-RF for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 19 May 2021 15:36:37 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36738) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljRaX-00039N-Bl for help-gnu-emacs@gnu.org; Wed, 19 May 2021 15:10:38 -0400 Original-Received: from mail.tuxteam.de ([5.199.139.25]:35918) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.90_1) (envelope-from ) id 1ljRaU-0001di-Gv for help-gnu-emacs@gnu.org; Wed, 19 May 2021 15:10:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tuxteam.de; s=mail; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date; bh=YyAmuAWhsKG8IC7o63YdkXaPpe/X18+KmqULGMvzKeI=; b=OEFw13SBzdr6sxFiWwOaLDLNEk8eEvvr99Lf1RFLMJ5yZ2WHt0aYZSpG27S81Tms40DjO2PCPAiUpVkZgh+59U3nG6QMFKApxC7cg5wGziO8PFfXsQI1uvF6uXOuY7i6C+oUidulZD9ZCoNmO2ruiRf0B7dPrI40CLV4wELFYtHnjDNuHKXFwGEPwF5bRfxc+T0YOul1Q6+yPSOKG/qFc610syfVNYqbihSMyEwR/Q0IFpAeFL6xJcpl+QKHd+e7F36GXp73ffRRIP8krHk2P9pDv3UzcmxDxoZvodK/KER9CQrouY1IDZz3IGnFq3CxIjGvjx2+aVvYqgDbodsnHQ==; Original-Received: from tomas by mail.tuxteam.de with local (Exim 4.80) (envelope-from ) id 1ljRaQ-0001JL-QS; Wed, 19 May 2021 21:10:30 +0200 Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=5.199.139.25; envelope-from=tomas@tuxteam.de; helo=mail.tuxteam.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:129939 Archived-At: --azLHFNyN32YCQGCU Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, May 19, 2021 at 11:39:46AM -0500, Skip Montanaro wrote: > > > Yes, use character sets, e.g. [+] and [-]. >=20 > > Plus "+" is special. Minus "-" is not. > ... > > Or escape with backslash. Note that due to string syntax you need > > two of them. >=20 > Yes, correct you are, Tomas. I long ago got used to putting most > punctuation in character sets regardless of its specialness, if for no > other reason than to help them stand out when rereading the code > later [...] Right: brackets help curbing the multiplication of backslashes. I've found another strange application for that: "ps waux | grep foo" will find your "grep foo" in the process list. Decorating one of your characters in "foo" with brackets will fix that. Hacky, but it works :) Cheers - t --azLHFNyN32YCQGCU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAmClYqYACgkQBcgs9XrR2kZzZwCcCBvdDe8H0SvIi9T58iTHn6+H 210AnA4deIF/GkKQytaA04gkwqizPTgr =ePOR -----END PGP SIGNATURE----- --azLHFNyN32YCQGCU--