From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: Ugly regexps Date: Wed, 03 Mar 2021 14:57:12 +0100 Message-ID: <87zgzkxruv.fsf@gnus.org> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2041"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Mar 03 15:03:15 2021 Return-path: Envelope-to: ged-emacs-devel@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 1lHS5q-0000OM-QP for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 15:03:14 +0100 Original-Received: from localhost ([::1]:34474 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lHS5p-0007GR-SF for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 09:03:13 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56950) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lHS0G-0002gQ-CT for emacs-devel@gnu.org; Wed, 03 Mar 2021 08:57:28 -0500 Original-Received: from quimby.gnus.org ([2a01:4f9:2b:f0f::2]:57104) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lHS0E-0003Rj-No for emacs-devel@gnu.org; Wed, 03 Mar 2021 08:57:28 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=iH5p7VNzQioS+OzL38Tbarn13ZRon6ZE/cLn4hCn2k4=; b=r9lVQgiUyi4swDcSiWY1Gz3oI1 8DQnqnQUxvi0O/zbytbdJL00ustuxD5wiJvGhROKFYOOzDGVQSS19eyJgfdl9Ep9rgxMgdJzfEkVO PBJTIXj1hbhQ0C3J7W2zaFOW86FVUy4gmPyov9YBg1W4gmRj16KcBP3oocfRnE38VKtQ=; Original-Received: from cm-84.212.220.105.getinternet.no ([84.212.220.105] helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lHS02-0000ig-31; Wed, 03 Mar 2021 14:57:19 +0100 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAgMAAAAqbBEUAAAABGdBTUEAALGPC/xhBQAAACBj SFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAADFBMVEUlSUJ/jWq7wr7/ //9UGKObAAAAAWJLR0QDEQxM8gAAAAd0SU1FB+UDAw01K9kdXQoAAAGWSURBVCjPdZHBattAEIb/ LZGoc7KKV9Q+pYdCq6eQAoL2JpWMkXVywTLWPkUeQQm2ITqF4BXeecrO2go9RaDDt//s/PPPAh9+ qtrS0TSrwZoC+FpGeVxmZckd8Lmi73GeVRG/ilJFAr+qQEDtytWNOjyUuS/7seUX66w06C4dU0xn UDPg5370uJH/bj2CCPjy7j718BhgvKjwzSpAWKVykLxchaAQXKvrvHqWFvj721dNIwqKFrsJpkH6 oMtlu4CZYKbSVVD+YQEHrTqTNw33WEepVpvkQHMz4Pm+mCtKnpY1M96eJSDVVB8FGj4BMZGxAu1S ILQUnwX26iz+Dd06wzirjUyji5BrAfjoAd64lzt49GE+WT4wViguCYiIQUivgWLny8ZwNRvE42OY Xnzia9XEDDxAp35HWMic/A5J7f6DObLxoEe4KFpabBLrIe40peFpYY3Awmrah+62NdseyVkThS50 fgcerOL7vpZuiRMl46xfemWnsyblfPDbiU8eTLd98j6FzkigtezkkXTWFuZ1bo37Bwwxk8kovNNh AAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDIxLTAzLTAzVDEzOjUzOjQzKzAwOjAwni2+9wAAACV0RVh0 ZGF0ZTptb2RpZnkAMjAyMS0wMy0wM1QxMzo1Mzo0MyswMDowMO9wBksAAAAASUVORK5CYII= X-Now-Playing: Front 242's _Official Version [1986-1987]_: "Masterhit (Part I & II)" In-Reply-To: (Stefan Monnier's message of "Tue, 02 Mar 2021 19:32:20 -0500") Received-SPF: pass client-ip=2a01:4f9:2b:f0f::2; envelope-from=larsi@gnus.org; helo=quimby.gnus.org 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:265877 Archived-At: Stefan Monnier writes: > So you can do > > (string-match (ere "\\(def(macro|un|subst) .{1,}")) > > instead of > > (string-match "(def\\(macro\\|un\\|subst\\) .\\{1,\\}") > > ? Sounds good to me. In some cases, introducing an alternative syntax can create confusion, but I don't think that's really the case here -- I think everybody knows this syntax, perhaps better than the Emacs regexp syntax. The byte compiler can do the transformation, I guess? (When it's a string literal, which is usually is.) So there should be no performance impact. And when Emacs finally grows support for a regexp object, then `ere' can return one of those. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no