From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: regular expressions that match nothing Date: Wed, 15 May 2019 22:17:41 +0200 Message-ID: <87a7fnzd3u.fsf@web.de> References: <7a6b23f52418b093a4cf7a6db4306cf425533249.camel@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="17653"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: Stefan Monnier , emacs-devel@gnu.org To: Mattias =?utf-8?Q?Engdeg=C3=A5rd?= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed May 15 22:19:31 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 1hR0N8-0004U6-Pr for ged-emacs-devel@m.gmane.org; Wed, 15 May 2019 22:19:31 +0200 Original-Received: from localhost ([127.0.0.1]:41926 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hR0N7-0008MU-IG for ged-emacs-devel@m.gmane.org; Wed, 15 May 2019 16:19:29 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:45945) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hR0Lk-0007wv-Le for emacs-devel@gnu.org; Wed, 15 May 2019 16:18:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hR0Lj-0001QE-RE for emacs-devel@gnu.org; Wed, 15 May 2019 16:18:04 -0400 Original-Received: from mout.web.de ([212.227.15.14]:55743) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hR0Lj-0001PQ-Hc for emacs-devel@gnu.org; Wed, 15 May 2019 16:18:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1557951463; bh=72qX8a17h8PFJMpi7H62VU/lxzl+tEX4UNKu+eKhAtc=; h=X-UI-Sender-Class:From:To:Cc:Subject:References:Date:In-Reply-To; b=N91gJGlnFujzLOmx5VouvtiXZbWBUa0DsEn4nq8B2qZ9/MLssQJmgEaiCmJrO0Cec +USnOynOoMWeUnzXBaaDyImbYO52DiuKrVfCZOxV7wGcSwDxGTg0HS0L66uu825eks GW+kd1KO7J3YqbQ1MUsXVR6uzUBhcI0sQtRfRaqI= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Original-Received: from drachen.dragon ([188.110.143.34]) by smtp.web.de (mrweb001 [213.165.67.108]) with ESMTPSA (Nemesis) id 0MRD4x-1hFdWK2DU7-00UbLW; Wed, 15 May 2019 22:17:43 +0200 In-Reply-To: <7a6b23f52418b093a4cf7a6db4306cf425533249.camel@acm.org> ("Mattias \=\?utf-8\?Q\?Engdeg\=C3\=A5rd\=22's\?\= message of "Wed, 15 May 2019 18:21:07 +0200") X-Provags-ID: V03:K1:zUrKyXL9bemyzo4z/g2OF6y9xculxaq6GUuzIrjnrvfhRwBcRPV KJ9PkLt7zm+vSga3W2tVa6bW7aBpmSMC635lodA3tf6RXHofgQitNbEeB7DTWn56wODxfA0 edpKYi3owARnTXNQOXh/x4oQUIjpebBqYrVn8zPsN+mlz55fJ70eT8rSTv+Aa1vf0+6I0xb aIZ9lyNq3TVP9mKO+WMYw== X-UI-Out-Filterresults: notjunk:1;V03:K0:SQ5w3AlwBl8=:IraWLUR5C39wPQdZA5l8sy jYppy0y3hD0kxMzHrbX11hdmLXJVfLdfaw3TEsbgOwPcy55ddldIfWGg0eZr1n3EHzfsQHwfd Vhd3AogNVhefzkk1C7Y+A9j3PfYWoNcoIFk5dUN+NZC2kisl2SjXGJ+GFAhZLb0z1+Uj0UMvl BG42rm8oPMTUMTXXizXuqUgUqLF82QfpPR+yULllFQhWNOt0TMXNSzjsxKsFDe2vAY/xj4QAt s2XAVtwfMdBs0auGnnd2UvpVKoNbKcnsPP97eLCIlFgN6k372TVExqtX5Htz1wDImwofk+6tw D38YDhWpZrQiqM0wNhpSsgesHve6wYmVQlWx7X51OqeF+y9IpoLGLdT5HEY5Fu/4FG+/evsMf ngjV95v+qNM2rAKxU9kC9Tw67ezRtPrnYn2o1XhWcrVZx6C/Xvzctb0+wyImJzUpkrDvB6IFv aKPHJuVXifWFlFbWS5dZ+1hjekZVZjGte+D9JfER61n73X5Ijny2+IxTcRSrQKblDpputoF3q 0KSbAmRNQGZxkSRB63kS1H4vpJRTlQ+U3naAFZhiZ6Pm8LbxbxDjDcBdOs8BWc5l+Vm+NRoFN 5w+kipgU6MZ6cC0Z0v8jFVDj3vhHBuYMPQ3rPKIblLsnRnDbKXFMv5gP3G6LGtZrOpzGbWXdf seTT0bNjekluimIR/GQ00NVstW+TUGyamTgRhUOI2ztkwmhVGY/13SdKspo/piCJW/FACpsS0 HHngOqvU9CLADiSiMUlvDVNrOYj8cX4JeFRvtu8NJKk1F4vvNyEC3ifa+ocs+w7BlD9yDA7n X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 212.227.15.14 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:236550 Archived-At: Mattias Engdeg=C3=A5rd writes: > The correct name is obviously something like `regexp-empty', but I have > to concede that it might be misinterpreted. The attached patch uses > `regexp-unmatchable' which is reasonably descriptive. Better > suggestions are welcome. Should there be an rx regexp form for this? Michael.