From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Ugly regexps Date: Wed, 03 Mar 2021 10:46:20 -0500 Message-ID: References: <83pn0g6ajq.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11225"; 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: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Mar 03 16:47:55 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 1lHTj9-0002oc-2F for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 16:47:55 +0100 Original-Received: from localhost ([::1]:58824 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lHTj8-00064O-5C for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 10:47:54 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56516) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lHThq-0005BF-S0 for emacs-devel@gnu.org; Wed, 03 Mar 2021 10:46:34 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:44826) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lHThm-00058t-MB; Wed, 03 Mar 2021 10:46:33 -0500 Original-Received: from pmg1.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 062DF100240; Wed, 3 Mar 2021 10:46:29 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 23B301000C9; Wed, 3 Mar 2021 10:46:27 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1614786387; bh=lQQRhnKpvUhtFxTTHHgaEsrEVCN8P1QXx9mr5LQGllI=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=OUfqpINa6vlsRdU7Q2HwZX4taPgiqjervvu+iZVR93UJnM/yVhDoOCfAgB7DfMgA1 ezy9PaFPDvZcsYjeipN93GAh+yTPSt/NFXmKUIwJsgH7X52nxIICswB13D8+8SjblO n6JG9XnTwpHyMmiLEqioXs23vVT5MnuXyKt1gQbgKWDQ60TjIb9kAnynQMUCIbR3V6 IQfwcH8F5J6gWx+AseMaIgAVSO5jLGjXp6pbrXEQsT3v068AhqTcf+EFUQsBZ3jUws 7pTS7EVkCmW/C4PuWpcbsa5ZVcWZHO5EFDXVJZwLO4UqwtPd02peY63XGSZlBH6gav CUBWUbKGIoxGA== Original-Received: from alfajor (unknown [216.154.41.47]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id D53591201C9; Wed, 3 Mar 2021 10:46:26 -0500 (EST) In-Reply-To: <83pn0g6ajq.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 03 Mar 2021 08:00:57 +0200") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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:265888 Archived-At: >> So you can do >> >> (string-match (ere "\\(def(macro|un|subst) .{1,}")) >> >> instead of >> >> (string-match "(def\\(macro\\|un\\|subst\\) .\\{1,\\}") > > Why not use 'rx' in those cases? Not sure what you mean by "those cases". I'm thinking this `ere` would be useful for the cases where the author finds `rx` unpalatable for some reason. > IMO it makes the regexp even more easy to write and read. I believe this depends on taste and circumstances. Experience shows that while some packages use `rx` extensively, most ELisp code doesn't. Stefan