From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Nicolas Richard Newsgroups: gmane.emacs.help Subject: Re: Regex replace for numbers Date: Fri, 03 Oct 2014 07:25:08 +0200 Message-ID: <874mvliv2j.fsf@geodiff-mac3.ulb.ac.be> References: <87zjdexa89.fsf@robertthorpeconsulting.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1412313950 26771 80.91.229.3 (3 Oct 2014 05:25:50 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 3 Oct 2014 05:25:50 +0000 (UTC) Cc: help-gnu-emacs@gnu.org To: Robert Thorpe Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Oct 03 07:25:43 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XZvN8-0000q8-Ps for geh-help-gnu-emacs@m.gmane.org; Fri, 03 Oct 2014 07:25:42 +0200 Original-Received: from localhost ([::1]:38017 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XZvN8-0001Cw-Ap for geh-help-gnu-emacs@m.gmane.org; Fri, 03 Oct 2014 01:25:42 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:45182) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XZvMk-0001Cl-Kj for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 01:25:25 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XZvMe-00044D-Dy for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 01:25:18 -0400 Original-Received: from mxin.ulb.ac.be ([164.15.128.112]:51277) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XZvMe-000433-8t for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 01:25:12 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApgKAIQyLlSkD4Xx/2dsb2JhbABghDm2YgEBAQabWQKBIAF7hAQBAQMBeQULCw4TJQ8BBEkTiCkBDAiqS4wWAYdoAReGFYIuh2MHhEsBBKUBjjeDZTsvgkoBAQE Original-Received: from mathsrv4.ulb.ac.be (HELO geodiff-mac3.ulb.ac.be) ([164.15.133.241]) by smtp.ulb.ac.be with ESMTP; 03 Oct 2014 07:25:10 +0200 In-Reply-To: <87zjdexa89.fsf@robertthorpeconsulting.com> (Robert Thorpe's message of "Fri, 03 Oct 2014 01:33:58 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 164.15.128.112 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:100242 Archived-At: Robert Thorpe writes: > I'm not very good with Emacs regex, I need to search-and-replace on some numbers. > > How can I detect unnecessary zeros at the end of a number and chop them > off? E.g. turn 567.45000 to 567.45 without also turning 6700 to 67. Instead of solving it with a regexp, I suggest some lisp : (save-excursion (goto-char (point-min)) (while (re-search-forward "[0-9]" nil t ) (let ((bounds (bounds-of-thing-at-point 'sexp)) (number (number-at-point))) (when number (delete-region (car bounds) (cdr bounds)) (insert (format "%s" number)))))) (This might not work in modes other than emacs-lisp mode, due to how number-at-point works.) you can test it on : foo0 5054.210 567.45000 567.04500 127.0.1.0 500 005 and get: foo0 5054.21 567.45 567.045 127.0.1.0 500 5 -- Nicolas Richard