From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Negative Lookahead Equivalent in emacs Date: Tue, 09 May 2017 09:16:15 +0200 Message-ID: References: <49e1dd7d-4be5-4b03-b9e2-e26b15b0a6cb@googlegroups.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1494314272 12223 195.159.176.226 (9 May 2017 07:17:52 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 9 May 2017 07:17:52 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue May 09 09:17:08 2017 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d7zON-0002KW-38 for geh-help-gnu-emacs@m.gmane.org; Tue, 09 May 2017 09:17:07 +0200 Original-Received: from localhost ([::1]:35458 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d7zOS-0006ih-KR for geh-help-gnu-emacs@m.gmane.org; Tue, 09 May 2017 03:17:12 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:60671) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d7zNk-0006Uf-Nl for help-gnu-emacs@gnu.org; Tue, 09 May 2017 03:16:29 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d7zNg-0004Rn-Au for help-gnu-emacs@gnu.org; Tue, 09 May 2017 03:16:28 -0400 Original-Received: from [195.159.176.226] (port=44092 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1d7zNg-0004RZ-4R for help-gnu-emacs@gnu.org; Tue, 09 May 2017 03:16:24 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1d7zNY-0001St-DZ for help-gnu-emacs@gnu.org; Tue, 09 May 2017 09:16:16 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Original-Lines: 25 Original-X-Complaints-To: usenet@blaine.gmane.org Mail-Copies-To: never Cancel-Lock: sha1:Ve1xj6F5pRNc+lKD73dXZOsefO4= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:112973 Archived-At: > I'm trying to write a regex that matches the > last character of a sequence of > non-whitespace characters '[^\n\r\t\f ]', or > an empty line matching ^$. > > Thus: Hello World! --> "o" and "!" would be > matched I would probably use syntax classes [1] for this, with numbered groups, as in this Elisp. Regexps are hairy tho so some fiddling and fine-tuning is expected: (when (re-search-forward "\\([[:graph:]]\\)[ \n]" (point-max) t) (goto-char (match-beginning 0)) (message (match-string-no-properties 1)) ) Hello World! [1] https://www.emacswiki.org/emacs/RegularExpression -- underground experts united http://user.it.uu.se/~embe8573