From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: regular expressions that match nothing Date: Mon, 20 May 2019 19:19:35 -0400 Message-ID: References: <7a6b23f52418b093a4cf7a6db4306cf425533249.camel@acm.org> <87ftpefevf.fsf@ericabrahamsen.net> <0E7D1DF3-682F-4FB9-8378-FEA3E9FDE5E9@acm.org> Reply-To: rms@gnu.org Content-Type: text/plain; charset=Utf-8 Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="183791"; mail-complaints-to="usenet@blaine.gmane.org" Cc: mattiase@acm.org, netjune@outlook.com, emacs-devel@gnu.org To: philippe schnoebelen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue May 21 01:30:04 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hSrjI-000lfJ-IQ for ged-emacs-devel@m.gmane.org; Tue, 21 May 2019 01:30:04 +0200 Original-Received: from localhost ([127.0.0.1]:43591 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hSrjH-0006kh-Do for ged-emacs-devel@m.gmane.org; Mon, 20 May 2019 19:30:03 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:47386) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hSrZB-00061k-5w for emacs-devel@gnu.org; Mon, 20 May 2019 19:19:38 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:34229) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hSrZB-0005JZ-0g; Mon, 20 May 2019 19:19:37 -0400 Original-Received: from rms by fencepost.gnu.org with local (Exim 4.82) (envelope-from ) id 1hSrZ9-00007t-1u; Mon, 20 May 2019 19:19:35 -0400 In-Reply-To: (message from philippe schnoebelen on Mon, 20 May 2019 09:56:47 +0200) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:236826 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] Maybe these will avoid confusion about matching the empty string: regexp-never regexp-nomatch regexp-dontmatch regexp-fail -- Dr Richard Stallman President, Free Software Foundation (https://gnu.org, https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)