Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed4a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'from:addr:yahoo.co.uk': 0.04; '"""': 0.07; 'explicit': 0.07; 'matches': 0.07; 'subject:Questions': 0.07; 'ascii': 0.09; 'happen?': 0.09; 'lawrence': 0.09; 'literal': 0.09; 'matched': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'jan': 0.12; 'language,': 0.12; 'assume': 0.14; 'language.': 0.14; "'0',": 0.16; "'c',": 0.16; '8-bit': 0.16; 'backslash': 0.16; 'expression,': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'skip:[ 60': 0.16; 'spacing': 0.16; 'underscore.': 0.16; 'prevent': 0.16; 'language': 0.16; 'wrote:': 0.18; '(but': 0.19; 'thanks.': 0.20; '>>>': 0.22; 'header:User-Agent:1': 0.23; 'affects': 0.24; 'byte': 0.24; 'string,': 0.24; 'unicode': 0.24; 'url:moin': 0.24; 'mon,': 0.24; 'question': 0.24; 'equivalent': 0.26; 'header:X-Complaints-To:1': 0.27; 'header:In-Reply-To:1': 0.27; 'chris': 0.29; 'am,': 0.29; 'character': 0.29; 'characters': 0.30; "i'm": 0.30; 'url:wiki': 0.31; 'adams': 0.31; 'regular': 0.32; 'run': 0.32; 'quite': 0.32; 'url:python': 0.33; 'cases': 0.33; 'used,': 0.33; 'there,': 0.34; 'but': 0.35; 'done': 0.36; 'thanks': 0.36; 'url:org': 0.36; 'january': 0.37; 'ahead': 0.38; 'skip:[ 10': 0.38; 'to:addr :python-list': 0.38; 'expect': 0.39; 'does': 0.39; 'though,': 0.39; 'to:addr:python.org': 0.39; 'either': 0.39; 'received:org': 0.40; 'read': 0.60; 'above,': 0.60; 'catch': 0.60; 'most': 0.60; 'numbers': 0.61; 'entire': 0.61; "you're": 0.61; 'such': 0.63; 'skip:n 10': 0.64; 'our': 0.64; 'different': 0.65; '26,': 0.68; 'alphanumeric': 0.68; 'btw),': 0.84; 'different.': 0.84 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Mark Lawrence Subject: Re: re Questions Date: Sun, 26 Jan 2014 17:30:47 +0000 References: <3f568767-e13a-4c7d-a4fb-85caca2adf6e@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: host-78-146-11-250.as13285.net User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 75 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1390757464 news.xs4all.nl 2961 [2001:888:2000:d::a6]:45014 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:64785 On 26/01/2014 17:15, Blake Adams wrote: > On Sunday, January 26, 2014 12:08:01 PM UTC-5, Chris Angelico wrote: >> On Mon, Jan 27, 2014 at 3:59 AM, Blake Adams wrote: >> >>> If I want to set up a match replicating the '\w' pattern I would assume that would be done with '[A-z0-9_]'. However, when I run the following: >> >>> >> >>> re.findall('[A-z0-9_]','^;z %C\@0~_') it matches ['^', 'z', 'C', '\\', '0', '_']. I would expect the match to be ['z', 'C', '0', '_']. >> >>> >> >>> Why does this happen? >> >> >> >> Because \w is not the same as [A-z0-9_]. Quoting from the docs: >> >> >> >> """ >> >> \w For Unicode (str) patterns:Matches Unicode word characters; this >> >> includes most characters that can be part of a word in any language, >> >> as well as numbers and the underscore. If the ASCII flag is used, only >> >> [a-zA-Z0-9_] is matched (but the flag affects the entire regular >> >> expression, so in such cases using an explicit [a-zA-Z0-9_] may be a >> >> better choice).For 8-bit (bytes) patterns:Matches characters >> >> considered alphanumeric in the ASCII character set; this is equivalent >> >> to [a-zA-Z0-9_]. >> >> """ >> >> >> >> If you're working with a byte string, then you're close, but A-z is >> >> quite different from A-Za-z. The set [A-z] is equivalent to >> >> [ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz] (that's >> >> a literal backslash in there, btw), so it'll also catch several >> >> non-alphabetic characters. With a Unicode string, it's quite >> >> distinctly different. Either way, \w means "word characters", though, >> >> so just go ahead and use it whenever you want word characters :) >> >> >> >> ChrisA > > Thanks Chris > I'm pleased to see that your question has been answered. Now would you please read and action this https://wiki.python.org/moin/GoogleGroupsPython to prevent us seeing the double line spacing above, thanks. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence