Path: csiph.com!news.swapon.de!fu-berlin.de!uni-berlin.de!not-for-mail From: Karim Newsgroups: comp.lang.python Subject: Re: Newbie: Check first two non-whitespace characters Date: Thu, 31 Dec 2015 20:05:02 +0100 Lines: 38 Message-ID: References: <240ab049-68a0-4a00-b911-d58cae9bfbcf@googlegroups.com> <568579DF.50805@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de +ts7NnDuvk0vjphFPftIvgC0T/Nw1yknqDEpo68/I+oA== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.012 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'ideally': 0.04; 'line:': 0.07; 'subject:two': 0.07; 'subject:characters': 0.09; 'forward:': 0.16; 'parse,': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'subject:non': 0.16; 'wrote:': 0.16; 'string': 0.17; '>>>': 0.20; 'to:2**1': 0.21; 'doc': 0.22; 'parse': 0.22; 'import': 0.24; 'header:In-Reply-To:1': 0.24; 'header:User-Agent:1': 0.26; '(which': 0.26; 'to:no real name:2**1': 0.27; 'be:': 0.29; 'depth': 0.29; 'print': 0.30; 'message-id:@gmail.com': 0.34; 'received:google.com': 0.35; 'could': 0.35; 'replace': 0.35; 'something': 0.35; 'received:74.125.82': 0.35; 'but': 0.36; 'should': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'method': 0.37; 'list.': 0.37; 'received:192': 0.39; 'subject:-': 0.39; 'to:addr:python.org': 0.40; 'space': 0.40; 'your': 0.60; "you'll": 0.61; 'hope': 0.61; 'email addr:gmail.com': 0.62; 'charset:windows-1252': 0.62; 'subject:Check': 0.95 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-type:content-transfer-encoding; bh=LAcM/j40+6euPUkYMBhiVA3VOBOmTBXcYboAESkKhcg=; b=xP+NRkIS2lVW0uOhBgUgQ/eKu04VErQZpbIDDqdwYc/DS3hWpCcg1NPzw5U3YpZj/d a3wdBJTp5ftK4z3kCe5xE5rUILE+85nz4P+jI2V+k1sf3S0yzBuzf+J30VAlLwljwl4e git1rlbluL6ql4BDJEZUtZpZqL3FAfMIMSMc5V8eInO+yCnO7R5UnEln/JVeRAqedUyq q+DXogU109dFFJxKp4PAm0G2qDD7KuEz4F4jbcqq0wMoGiQJoKcJ5kLPA6qMA9PlOED+ hrBcpp9t5kAJKBQbQU27nHK50t9JN33YyU97q61nmzDZwcHTbqY+idmWYct9M0kMGdds PDlw== X-Received: by 10.28.47.213 with SMTP id v204mr66753579wmv.69.1451588704197; Thu, 31 Dec 2015 11:05:04 -0800 (PST) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 In-Reply-To: <568579DF.50805@gmail.com> X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:101075 On 31/12/2015 19:54, Karim wrote: > > > On 31/12/2015 19:18, otaksoftspamtrap@gmail.com wrote: >> I need to check a string over which I have no control for the first 2 >> non-white space characters (which should be '[{'). >> >> The string would ideally be: '[{...' but could also be something like >> ' [ { ....'. >> >> Best to use re and how? Something else? > > Use pyparsing it is straight forward: > > >>> from pyparsing import Suppress, restOfLine > > >>> mystring = Suppress('[') + Suppress('{') + restOfLine > > >>> result = mystring.parse(' [ { .... I am learning pyparsing' ) > > >>> print result.asList() > > ['.... I am learning pyparsing'] > > You'll get your string inside the list. > > Hope this help see pyparsing doc for in depth study. > > Karim Sorry the method to parse a string is parseString not parse, please replace by this line: >>> result = mystring.parseString(' [ { .... I am learning pyparsing' ) Regards