Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.011 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'escape': 0.04; 'python': 0.08; 'expressions.': 0.09; 'matt': 0.09; 'subject:python': 0.11; 'backslashes': 0.16; "doesn't.": 0.16; 'offense': 0.16; 'prepended': 0.16; 'shed': 0.16; 'subject:expression': 0.16; 'subject:regular': 0.16; 'subject:Help': 0.17; 'figure': 0.21; "doesn't": 0.22; 'header:In-Reply-To:1': 0.22; 'received:209.85.212.46': 0.23; 'received:mail- vw0-f46.google.com': 0.23; "skip:' 40": 0.23; 'string': 0.26; '(in': 0.26; 'work.': 0.27; 'scientific': 0.28; 'problem': 0.28; 'url:mailman': 0.28; 'matches': 0.29; 'source,': 0.29; 'message- id:@mail.gmail.com': 0.29; 'example': 0.30; 'match': 0.30; 'times.': 0.30; 'character.': 0.30; 'line:': 0.30; 'pattern': 0.30; 'whitespace': 0.30; 'thanks': 0.30; 'expression': 0.32; 'go.': 0.32; 'hi,': 0.32; 'handling': 0.32; 'does': 0.32; 'it.': 0.33; 'there': 0.33; 'to:addr:python-list': 0.33; 'url:listinfo': 0.33; 'light': 0.34; 'however,': 0.34; 'someone': 0.34; 'quite': 0.34; 'received:209.85.212': 0.34; 'list.': 0.35; 'supposed': 0.35; 'regular': 0.35; 'url:python': 0.36; 'question': 0.36; 'using': 0.37; 'some': 0.38; 'received:google.com': 0.38; 'url:org': 0.38; 'received:209.85': 0.38; 'should': 0.38; 'subject:: ': 0.39; 'either': 0.39; 'subject:with': 0.39; 'format.': 0.39; 'why': 0.39; 'to:addr:python.org': 0.39; 'description': 0.39; "i'd": 0.40; 'raw': 0.40; 'where': 0.40; 'double': 0.61; 'subject': 0.61; 'order': 0.62; 'vary': 0.64; 'funk': 0.84; 'quotation': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=RQhlTa57WVgHATvp7y94Pqdm2sziNebS5GQcNuUkj90=; b=CKLRIHzuqHI3As2bgAbH2ExihjFDFWSzbwA576yClynjXZe0zpRFfVO1snMa6WgVuH zbwVRgVYRh489QDE1EmHaFMmXjG4K5zuqXV4fLCZ084WyNAWxYot1jufyPjdzM2fgn4W 1G+rRyeBwXoLpDhw9+roFLvNmUSL8qbwNzQfI= MIME-Version: 1.0 In-Reply-To: <201108181349.54727.matze999@gmail.com> References: <201108181349.54727.matze999@gmail.com> Date: Thu, 18 Aug 2011 23:27:42 +0200 Subject: Re: Help with regular expression in python From: Vlastimil Brom To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 49 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1313702865 news.xs4all.nl 23917 [2001:888:2000:d::a6]:57801 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:11809 2011/8/18 Matt Funk : > Hi, > i am sorry if this doesn't quite match the subject of the list. If someon= e > takes offense please point me to where this question should go. Anyway, i= have > a problem using regular expressions. I would like to match the line: > > 1.002000e+01 2.037000e+01 2.128000e+01 1.908000e+01 1.871000e+01 1.914000= e+01 > 2.007000e+01 1.664000e+01 2.204000e+01 2.109000e+01 2.209000e+01 2.376000= e+01 > 2.158000e+01 2.177000e+01 2.152000e+01 2.267000e+01 1.084000e+01 1.671000= e+01 > 1.888000e+01 1.854000e+01 2.064000e+01 2.000000e+01 2.200000e+01 2.139000= e+01 > 2.137000e+01 2.178000e+01 2.179000e+01 2.123000e+01 2.201000e+01 2.150000= e+01 > 2.150000e+01 2.199000e+01 : (instance: 0) =A0 =A0 =A0 : =A0 =A0 =A0 some = description > > The number of floats can vary (in this example there are 32). So what i t= hought > i'd do is the following: > instance_linetype_pattern_str =3D '([-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+= )?) > {32}' > instance_linetype_pattern =3D re.compile(instance_linetype_pattern_str) > Basically the expression in the first major set of paranthesis matches a > scientific number format. The '{32}' is supposed to match the previous 32 > times. However, it doesn't. I =A0can't figure out why this does not work.= I'd > really like to understand it if someone can shed light on it. > > thanks > matt > -- > http://mail.python.org/mailman/listinfo/python-list > Hi, the already suggested handling of whitespace with \s+ etc. at the end of the parenthesised patern should help; furhtermore, if you are using this pattern in the python source, you should either double all backslashes or use a raw string for the pattern - with r prepended before the opening quotation mark: pattern_str =3D r"..." in order to handle backslashes literally and not as escape character. hth, vbr