Received: (at 16871) by debbugs.gnu.org; 18 Nov 2016 17:40:54 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Nov 18 12:40:54 2016 Received: from localhost ([127.0.0.1]:34182 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1c7n9i-00012V-G9 for submit <at> debbugs.gnu.org; Fri, 18 Nov 2016 12:40:54 -0500 Received: from mail-wm0-f65.google.com ([74.125.82.65]:33940) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <stephane.chazelas@HIDDEN>) id 1c7n9g-00012I-Lg for 16871 <at> debbugs.gnu.org; Fri, 18 Nov 2016 12:40:53 -0500 Received: by mail-wm0-f65.google.com with SMTP id g23so8444825wme.1 for <16871 <at> debbugs.gnu.org>; Fri, 18 Nov 2016 09:40:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:subject:message-id:mime-version:content-disposition :user-agent; bh=f5RIUnFY1ltZ5CWn8zoKGNIR6dwc+yujBzA2A1UsgHQ=; b=Yi4Uog7D03j5yAaKhz/y1hvBgCjydipW5ygaFYcQ5fSnZhv2lxmQp2Tok9lbtZLwab uqdxK/UED9PSP3O9OKdL5CNC3ESw2z24vbGaJ4fsTRkR7xXWi9ch0+s40ZAyDF7pLl6H Q4hj/r4L/B3icMX9vCng2z0fZt2j+1G0tcWASiaJkWxwXNTBzAABzaN8ibd5lJ9kdrjy jApCmoQxgcy9fzRedMRqufWF6uM8BGzHR9MnB6xe3V2RHnv1J2O7T/HXWheOFEMBVgZZ TsqznhTcrPIEN1IN/0h5oNOj0zt1E2Qz+rXmddHZSsAZ1KrlYp6D+4uEQAX6qjQHwGjo H+hQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:subject:message-id:mime-version :content-disposition:user-agent; bh=f5RIUnFY1ltZ5CWn8zoKGNIR6dwc+yujBzA2A1UsgHQ=; b=l3o04NdzvTTiL25MkWliQbbVZrcTuYjWT60rI1mAq7twzd+mn1BBV1YYR50YWZz9ME E86UFFr3xj1q4y01jpIFjFHcqYmjL+CHy1pI/9Snabvkw5xFrEJAp1eZKD458psVFGXV volUtJoIW8OWDkwnfKTSbY1+Eg7t00xBv9+Ed3OPV1m7vTaS2HpKT3DtMufQ/oP4bCrI OaEVhANoYgpU+z2+UEmv94arvssY8vW1kZ7wP1anxQ5En/QwMjtiF0KCJRa8NB+HAczI Qj4p6BffoEitzbuWFMBoIdIWb+yLx0itmM01cxwV5kgFu5nGBvq8gwJqYdG0dt17iiPp NXEA== X-Gm-Message-State: AKaTC00qH60/SEcwj6oCEMRwecyHrywAQHPEi6h0gN8nwvKywIeuBvVKakfZXjCGrf+CBA== X-Received: by 10.28.113.218 with SMTP id d87mr1365006wmi.111.1479490846837; Fri, 18 Nov 2016 09:40:46 -0800 (PST) Received: from chaz.gmail.com ([90.201.137.34]) by smtp.gmail.com with ESMTPSA id l67sm4458741wmf.20.2016.11.18.09.40.45 for <16871 <at> debbugs.gnu.org> (version=TLS1_2 cipher=AES128-SHA bits=128/128); Fri, 18 Nov 2016 09:40:45 -0800 (PST) Date: Fri, 18 Nov 2016 17:40:44 +0000 From: Stephane Chazelas <stephane.chazelas@HIDDEN> To: 16871 <at> debbugs.gnu.org Subject: doc/test confusions with grep -P Message-ID: <20161118174044.GD10084@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: 0.5 (/) X-Debbugs-Envelope-To: 16871 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: 0.5 (/) For the record, the doc/test confusion was fixed by commit b73296ace186451b096b075461634c153d1fa525 http://git.savannah.gnu.org/cgit/grep.git/commit/?id=b73296ace186451b096b075461634c153d1fa525 See also https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22655#47 and below about PCRE_MULTILINE.
bug-grep@HIDDEN:bug#16871; Package grep.
Full text available.Paul Eggert <eggert@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 16871) by debbugs.gnu.org; 25 Apr 2014 04:27:47 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Apr 25 00:27:47 2014 Received: from localhost ([127.0.0.1]:57815 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WdXjm-00021k-9X for submit <at> debbugs.gnu.org; Fri, 25 Apr 2014 00:27:46 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:56311) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eggert@HIDDEN>) id 1WdXjj-00021Z-Ir for 16871 <at> debbugs.gnu.org; Fri, 25 Apr 2014 00:27:44 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id D82C739E8012; Thu, 24 Apr 2014 21:27:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3VFQIGFvYGYy; Thu, 24 Apr 2014 21:27:38 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 95D1939E8016; Thu, 24 Apr 2014 21:27:38 -0700 (PDT) Message-ID: <5359E43A.2070709@HIDDEN> Date: Thu, 24 Apr 2014 21:27:38 -0700 From: Paul Eggert <eggert@HIDDEN> Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Stephane Chazelas <stephane.chazelas@HIDDEN>, 16871 <at> debbugs.gnu.org Subject: Re: bug#16871: problems about matching newline (with -z) References: <20140225073218.GA18853@HIDDEN> In-Reply-To: <20140225073218.GA18853@HIDDEN> Content-Type: multipart/mixed; boundary="------------010104050602070501040309" X-Spam-Score: -3.0 (---) X-Debbugs-Envelope-To: 16871 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.0 (---) This is a multi-part message in MIME format. --------------010104050602070501040309 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Stephane Chazelas wrote: > The doc has a confusing statement ... Same confusion in tests/pcre: Thanks, I installed the attached patch to fix those. > We can match a newline with grep -zP 'a\nb' (or '\x0a' or '\012' > or '[\n]'...) but not easily without -P. Same for NUL > characters. Yes, that's a downside of the POSIX notation, and it'd be nice to extend POSIX to allow easy matching for newlines and/or null bytes. 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bug-grep@HIDDEN:bug#16871; Package grep.
Full text available.Received: (at 16871) by debbugs.gnu.org; 25 Feb 2014 11:33:05 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Feb 25 06:33:05 2014 Received: from localhost ([127.0.0.1]:38705 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WIGG0-0008H1-Sx for submit <at> debbugs.gnu.org; Tue, 25 Feb 2014 06:33:05 -0500 Received: from mail-wi0-f179.google.com ([209.85.212.179]:63946) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <stephane.chazelas@HIDDEN>) id 1WIGFy-0008GU-EC for 16871 <at> debbugs.gnu.org; Tue, 25 Feb 2014 06:33:02 -0500 Received: by mail-wi0-f179.google.com with SMTP id bs8so545900wib.0 for <16871 <at> debbugs.gnu.org>; Tue, 25 Feb 2014 03:32:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=C3RCZ4rRiB9s8pdMOoa1lEG+roJIfhjcNIoAOWQ1vMQ=; b=ZvOLF5afCpO+7gpFWIbAris8Psxyc3+7e0PnR3SE9rFeXgBJ0MLp6fAJv5H7yyzfsr StgTKZSsqnL2H0JodUUqULFhcsQm3Kefm8TqnXSh+oLjobJG4SKtbCKk6cZyw6ErZy6N wOHe7RnBmHJmlbEv+6q8X5FsRJFs2LZqJoyO4p3ABr2SQ11RDh1DNiXDynmECmBBYGJC tIi8rK3NJ5e+BXtc6Ul2cQFWCknnKSA4o64PlzFgX/DvD/FZKHCaFdPDK604mNiHIeSI AHQQdgKCT87qSOHAsonfU/oqxz3AnGMcBgPj2vSud7d14KHyqZlhx626enWS2g+hmYiX HN4g== X-Received: by 10.180.87.162 with SMTP id az2mr2358929wib.23.1393327965722; Tue, 25 Feb 2014 03:32:45 -0800 (PST) Received: from chaz.gmail.com (188-223-3-27.zone14.bethere.co.uk. [188.223.3.27]) by mx.google.com with ESMTPSA id f7sm49965001wjb.7.2014.02.25.03.32.44 for <16871 <at> debbugs.gnu.org> (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 25 Feb 2014 03:32:44 -0800 (PST) Date: Tue, 25 Feb 2014 11:32:43 +0000 From: Stephane Chazelas <stephane.chazelas@HIDDEN> To: 16871 <at> debbugs.gnu.org Subject: Re: bug#16871: Acknowledgement (problems about matching newline (with -z)) Message-ID: <20140225113243.GB18853@HIDDEN> References: <20140225073218.GA18853@HIDDEN> <handler.16871.B.13933135695090.ack <at> debbugs.gnu.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <handler.16871.B.13933135695090.ack <at> debbugs.gnu.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 16871 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) Also: $ printf 'a\nb\0' | grep -z 'a$' $ printf 'a\nb\0' | grep -zP 'a$' a b $ printf 'a\nb\0' | grep -zxP a a b Why use PCRE_MULTILINE here?
bug-grep@HIDDEN:bug#16871; Package grep.
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Date: Tue, 25 Feb 2014 07:32:18 +0000
From: Stephane Chazelas <stephane.chazelas@HIDDEN>
To: bug-grep@HIDDEN
Subject: problems about matching newline (with -z)
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The doc has a confusing statement:
> 15. How can I match across lines?
>
> Standard grep cannot do this, as it is fundamentally line-based.
> Therefore, merely using the '[:space:]' character class does not
> match newlines in the way you might expect. However, if your grep
> is compiled with Perl patterns enabled, the Perl 's' modifier
> (which makes '.' match newlines) can be used:
>
> printf 'foo\nbar\n' | grep -P '(?s)foo.*?bar'
>
> With the GNU 'grep' option '-z' (*note File and Directory
> Selection::), the input is terminated by null bytes. Thus, you can
> match newlines in the input, but the output will be the whole file,
> so this is really only useful to determine if the pattern is
> present:
>
> printf 'foo\nbar\n' | grep -z -q 'foo[[:space:]]\+bar'
>
> Failing either of those options, you need to transform the input
> before giving it to 'grep', or turn to 'awk', 'sed', 'perl', or
> many other utilities that are designed to operate across lines.
printf 'foo\nbar\n' | grep -P '(?s)foo.*?bar'
Will never match as it's line-based even with -P. -P doesn't
help here, it makes it harder as you need that (?s).
printf 'foo\nbar\n\0' | grep -z 'foo.*bar'
would match.
Same confusion in tests/pcre:
> #! /bin/sh
> # Ensure that with -P, \s*$ matches a newline.
> #
> # Copyright (C) 2001, 2006, 2009-2014 Free Software Foundation, Inc.
> #
> # Copying and distribution of this file, with or without modification,
> # are permitted in any medium without royalty provided the copyright
> # notice and this notice are preserved.
>
> . "${srcdir=.}/init.sh"; path_prepend_ ../src
> require_pcre_
>
> fail=0
>
> # See CVS revision 1.32 of "src/search.c".
> echo | grep -P '\s*$' || fail=1
>
> Exit $fail
'\s*$' doesn't match a newline, but an empty string.
You need echo | grep -zP '\s' to match the newline.
Also:
We can match a newline with grep -zP 'a\nb' (or '\x0a' or '\012'
or '[\n]'...) but not easily without -P. Same for NUL
characters.
Without -P, the only way I could think of was with
[^\0-\011\013-\377], but that would only work for single-byte
locales, and you can't pass a nul character on the command line,
so it would have to be with -f but:
$ printf 'a\nb\0' | LC_ALL=C grep -zf <(LC_ALL=C printf 'a[^\0-\011\013-\377]b')
zsh: done printf 'a\nb\0' |
zsh: segmentation fault LC_ALL=C grep -zf <(LC_ALL=C printf 'a[^\0-\011\013-\377]b')
Having said that:
grep -z $'a[^\01-\011\013-\0377]b'
would work (in single-byte locales) since nul is not in the
input since it's the delimiter.
and grep -a $'[^\01-\0377]' can match nul (in single-byte
locales).
But it would be handly to be able to do the same as with -P.
--
Stephane
Stephane Chazelas <stephane.chazelas@HIDDEN>:bug-grep@HIDDEN.
Full text available.bug-grep@HIDDEN:bug#16871; Package grep.
Full text available.
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