From unknown Fri Sep 05 08:56:38 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63819: Gnu `grep '.*'` does not match an empty string. Resent-From: "Bob Vincent Il (US)" Original-Sender: "Debbugs-submit" Resent-CC: bug-grep@gnu.org Resent-Date: Wed, 31 May 2023 23:02:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 63819 X-GNU-PR-Package: grep X-GNU-PR-Keywords: To: 63819@debbugs.gnu.org X-Debbugs-Original-To: "bug-grep@gnu.org" Received: via spool by submit@debbugs.gnu.org id=B.16855740875717 (code B ref -1); Wed, 31 May 2023 23:02:02 +0000 Received: (at submit) by debbugs.gnu.org; 31 May 2023 23:01:27 +0000 Received: from localhost ([127.0.0.1]:36504 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4Uom-0001U5-Lm for submit@debbugs.gnu.org; Wed, 31 May 2023 19:01:27 -0400 Received: from lists.gnu.org ([209.51.188.17]:51670) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4PTG-0006pb-6Y for submit@debbugs.gnu.org; Wed, 31 May 2023 13:18:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q4PTF-0007di-QT for bug-grep@gnu.org; Wed, 31 May 2023 13:18:49 -0400 Received: from mx08-00096706.pphosted.com ([91.207.212.192]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q4PTA-0006vl-0w for bug-grep@gnu.org; Wed, 31 May 2023 13:18:49 -0400 Received: from pps.filterd (m0240461.ppops.net [127.0.0.1]) by mx07-00096706.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34VH3Xap027922 for ; Wed, 31 May 2023 17:18:34 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pwc.com; h=from : to : subject : date : message-id : content-type : mime-version; s=Gtwy2-05132021-ehtnJT9NLo6C; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=fHmoU9ph7gkORKvilu8jxxAvQCZrssGLblGRkddc8Ttfu2HLLO5SEfgMx09TpbIlyapH SJ7nFC/kaROqc9I9J7xxKa5aOlgNR3eIjqGyhZwF+MsjLvkrzAdwdQLwUi8tXDM/qctp r1a+62v/mJQ39mPD/38/rRCMh8/Xlyp4VtsiQS9/9SG02aBJ5YIlnZ/eYjZZ8xNOVnuh mnauygLFm++oToO/4f7pqhVZy9Um9k3FKmU63Y7jFf7fgw6BV7jT96ZqQkVUP9LZpP70 YogOELIBox69D92GTikQ+vc4HrDU3PeUyNdsO21+Xboj69Ok/bMwM/OcWaC1aFS+4WBG Cg== Received: from nam12-bn8-obe.outbound.protection.outlook.com (mail-bn8nam12lp2174.outbound.protection.outlook.com [104.47.55.174]) by mx07-00096706.pphosted.com (PPS) with ESMTPS id 3qxaa6g724-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Wed, 31 May 2023 17:18:33 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XKuBxwh94bERpSh5YiWAl13EXxyXt/gSevLdRPeR1Mk2YIkE+co99DopEJumWGiCAwoDIjho0PLfNGM5FIDu21xOoZK0vWV7ltsSRYDKpcOCnq7S3tWtjBx4VD/N4/WhoTY2380pgzD4SPYmMceKIrMnNPKnqsXh7AGrXec3PQ/9WQYBUAJcX7r4g3WrjsMm+LVGsJ1gUZkJF7rZIg+iQznNQf5IYGzdSEhxatuj+7DxcYT8s2JiG5XjvWri7rPBnHRrXf0Ms/QIYtY0+ZvSD5HhGQnrNbim8xQPdcs9lZ1eRrGtQ+7JzCACMl/KfCqKab+LY7PfIAOM7NNX6oEt8g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=WzBJvToxXI8zB2aMMnFddOE9Bl73xuCu4foXf6N5nB5AWBbt9yuPHmngsYgNcPiAPL274OdWwaKqAplOrT4ATZOPiBHIs2FTYY98HoxKXCicAA/7IHsXPP1tZJ6j1mIaQHu/CWN5xkklqpprzT2sZf8hyEDlNjbELRbPgpOTkF5ny7Hgvefl3SlNkhAzqXmKY/a/B4RqfJalS+hHVKLeqvFyuCF/JvmPEv8quAGWzd29XVrfuwzY8QaHBUU1wc6wzxea+KqPeQ2VBnAt8zzirBLYOeXOVuGsds1zGVFOZLxdPcrit9Jy0i2coMz4vBpsJfg3i74NUFkWZB8dtqwUnA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=pwc.com; dmarc=pass action=none header.from=pwc.com; dkim=pass header.d=pwc.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pwc.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=PcuyHse9vt+INjmWVK8yCVzhUxkat0Cfljp1J38CxU0fnBGNF7C2oidRuewnDSdv5jbZY7bOTobfO3FvLaq73Zao37M2oda2nHhMwC5e8UIYvnUYlVIOzfI+SCMYz6kzAiSQSO6+L/0cQN1gLz6oasoULkkKQJyjBTZxu2uCecY= Received: from DM6PR19MB2812.namprd19.prod.outlook.com (2603:10b6:5:13b::20) by BL1PR19MB5939.namprd19.prod.outlook.com (2603:10b6:208:39a::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6477.7; Wed, 31 May 2023 17:18:30 +0000 Received: from DM6PR19MB2812.namprd19.prod.outlook.com ([fe80::7443:6237:454c:2994]) by DM6PR19MB2812.namprd19.prod.outlook.com ([fe80::7443:6237:454c:2994%7]) with mapi id 15.20.6455.020; Wed, 31 May 2023 17:18:30 +0000 From: "Bob Vincent Il (US)" Thread-Topic: Gnu `grep '.*'` does not match an empty string. 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envelope-from=robert.a.vincent.ii@pwc.com; helo=mx08-00096706.pphosted.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.163, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, URI_NOVOWEL=0.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -0.9 (/) X-Mailman-Approved-At: Wed, 31 May 2023 19:01:23 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.9 (-) --_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I discovered only today that the following commands all behave identically: * grep -q '.*' * grep -q '.\+' * grep -q . * grep -qE '.*' * grep -qE '.+' * grep -qE . Gnu grep documentation says: The period =91.=92 matches any single character. It is unspecified whether = =91.=92 matches an encoding error. and =91*=92 The preceding item is matched zero or more times. I would think that an empty string matches "zero or more of any single char= acter". Can anyone point out where the documentation says otherwise? Bob Vincent (US) PwC IT - NGC - PUPPET DEV OPS | Senio= r Manager Work: 906-984-3549 Mobile: 770-744-1792 PricewaterhouseCoopers LLP @workday @githu= b @ServiceNow ________________________________ The information transmitted, including any attachments, is intended only fo= r the person or entity to which it is addressed and may contain confidentia= l and/or privileged material. Any review, retransmission, dissemination or = other use of, or taking of any action in reliance upon, this information by= persons or entities other than the intended recipient is prohibited, and a= ll liability arising therefrom is disclaimed. If you received this in error= , please contact the sender and delete the material from any computer. In the event the content of this email includes Tax advice, the content of = this email is limited to the matters specifically addressed herein and is n= ot intended to address other potential tax consequences or the potential ap= plication of tax penalties to this or any other matter. PricewaterhouseCoopers LLP is a Delaware limited liability partnership. Thi= s communication may come from PricewaterhouseCoopers LLP or one of its subs= idiaries. ________________________________ --_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I discovered only today that the following c= ommands all behave identically:
  • grep -q '.*'
  • grep -q '.\+'
  • grep -q .
  • grep -qE '.*'
  • grep -qE '.+'
  • grep -qE .
Gnu grep documentation says:

The period =91.=92 matches any single character. It is unspecified whether =91.and
=91*<= /span>=92<= /dt>

The preceding item is ma= tched zero or more times.


I would think that an empty string matches &= quot;zero or more of any single character".

Can anyone point out where the documentation= says otherwise?



The information transmitted, including any attachments, is intended only= for the person or entity to which it is addressed and may contain confiden= tial and/or privileged material. Any review, retransmission, dissemination = or other use of, or taking of any action in reliance upon, this information by persons or entities other tha= n the intended recipient is prohibited, and all liability arising therefrom= is disclaimed. If you received this in error, please contact the sender an= d delete the material from any computer.


In the event the content of this email includes Tax advice, the content = of this email is limited to the matters specifically addressed herein and i= s not intended to address other potential tax consequences or the potential= application of tax penalties to this or any other matter.


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--_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_-- From unknown Fri Sep 05 08:56:38 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63819: Gnu `grep '.*'` does not match an empty string. Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-grep@gnu.org Resent-Date: Thu, 01 Jun 2023 00:43:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63819 X-GNU-PR-Package: grep X-GNU-PR-Keywords: To: "Bob Vincent Il (US)" Cc: 63819@debbugs.gnu.org Received: via spool by 63819-submit@debbugs.gnu.org id=B63819.168558017516002 (code B ref 63819); Thu, 01 Jun 2023 00:43:01 +0000 Received: (at 63819) by debbugs.gnu.org; 1 Jun 2023 00:42:55 +0000 Received: from localhost ([127.0.0.1]:36543 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4WP1-0004A2-FM for submit@debbugs.gnu.org; Wed, 31 May 2023 20:42:55 -0400 Received: from mail.cs.ucla.edu ([131.179.128.66]:50880) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4WOz-00049m-L7 for 63819@debbugs.gnu.org; Wed, 31 May 2023 20:42:54 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 571E73C02213D; Wed, 31 May 2023 17:42:48 -0700 (PDT) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id W_uE8mTQkL5s; Wed, 31 May 2023 17:42:48 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 1F0263C09FA06; Wed, 31 May 2023 17:42:48 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu 1F0263C09FA06 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1685580168; bh=VstBZEwT0pzt0888lInUBcLnuyNbSylhzz3JLl5FMOc=; h=Message-ID:Date:MIME-Version:To:From; b=S33IFyDWPsHumTZyzqRUhHn81OHputYDuZdSMEBkxYVHreSHOM/6Hfh+janTzNpjA 5w/X60VTGm0gryxdMvUVtDKw4b4NRkewIUJcSBRmofclnE/fmxgVT5/Rl9+hiLo8DK 0Y4dEzwSJBPER3LHMeV7XEg6PN/9wOqjUHpp+hI2s25lPCbhRfrt87K99UuRyvCGhF Ilhrd2Mandf78meYsTcu/hs3G3TGS+Kyw5pgtZ0UEhSrWgyZQEyi+nbEBQ9Ezjw6i5 rpToTRIzSDsmjodLoNuJe2BZwp4pTgntnS1GafJEkbXgoCUqf5OAt4EfJIs7fMt6EO GlrMPDHJTLCYg== X-Virus-Scanned: amavisd-new at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id zBm8xLEkEUbO; Wed, 31 May 2023 17:42:48 -0700 (PDT) Received: from [192.168.1.9] (cpe-172-91-119-151.socal.res.rr.com [172.91.119.151]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id F0DDA3C02213D; Wed, 31 May 2023 17:42:47 -0700 (PDT) Message-ID: <65bbc76f-cc20-7b78-8959-b24ccfb23596@cs.ucla.edu> Date: Wed, 31 May 2023 17:42:47 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Content-Language: en-US References: From: Paul Eggert Organization: UCLA Computer Science Department In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.1 (-) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.1 (--) On 2023-05-31 10:18, Bob Vincent Il (US) via Bug reports for GNU grep wrote: > I discovered only today that the following commands all behave identically: > > * grep -q '.*' > * grep -q '.\+' > * grep -q . > * grep -qE '.*' > * grep -qE '.+' > * grep -qE . No they don't. For example: $ echo '' | grep -q . ; echo $? 1 $ echo '' | grep -q '.*' ; echo $? 0 From unknown Fri Sep 05 08:56:38 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63819: Gnu `grep '.*'` does not match an empty string. 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Okay, but `echo ''` does not output an empty string. It outputs a line feed= character. Bob Vincent (US-TSO) PwC IT - NGC - PUPPET DEV OPS | Senior Manager Work: 906-984-3549 Mobile: 770-744-1792 PricewaterhouseCoopers LLP ________________________________ From: Paul Eggert Sent: Wednesday, May 31, 2023 8:42:47 PM To: Bob Vincent Il (US) Cc: 63819@debbugs.gnu.org <63819@debbugs.gnu.org> Subject: Re: bug#63819: Gnu `grep '.*'` does not match an empty string. On 2023-05-31 10:18, Bob Vincent Il (US) via Bug reports for GNU grep wrote= : > I discovered only today that the following commands all behave identicall= y: > > * grep -q '.*' > * grep -q '.\+' > * grep -q . > * grep -qE '.*' > * grep -qE '.+' > * grep -qE . No they don't. For example: $ echo '' | grep -q . ; echo $? 1 $ echo '' | grep -q '.*' ; echo $? 0 ________________________________ The information transmitted, including any attachments, is intended only fo= r the person or entity to which it is addressed and may contain confidentia= l and/or privileged material. Any review, retransmission, dissemination or = other use of, or taking of any action in reliance upon, this information by= persons or entities other than the intended recipient is prohibited, and a= ll liability arising therefrom is disclaimed. If you received this in error= , please contact the sender and delete the material from any computer. In the event the content of this email includes Tax advice, the content of = this email is limited to the matters specifically addressed herein and is n= ot intended to address other potential tax consequences or the potential ap= plication of tax penalties to this or any other matter. PricewaterhouseCoopers LLP is a Delaware limited liability partnership. Thi= s communication may come from PricewaterhouseCoopers LLP or one of its subs= idiaries. ________________________________ --_000_DM6PR19MB281215FDCF6E67868CB8AF25EF499DM6PR19MB2812namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Okay, but `echo ''` does not output an empty s= tring. It outputs a line feed character.


Bob Vincent (US-TSO) 

PwC IT - NGC - PUPPET DEV OPS | Senior Manager
Work: 906-984-3549
Mobile: 770-744-1792
PricewaterhouseCoopers LLP
From: Paul Eggert <egger= t@cs.ucla.edu>
Sent: Wednesday, May 31, 2023 8:42:47 PM
To: Bob Vincent Il (US) <robert.a.vincent.ii@pwc.com>
Cc: 63819@debbugs.gnu.org <63819@debbugs.gnu.org>
Subject: Re: bug#63819: Gnu `grep '.*'` does not match an empty stri= ng.
 
On 2023-05-31 10:18, Bob Vincent Il (US) via Bug r= eports for GNU grep wrote:
> I discovered only today that the following commands all behave identic= ally:
>
>    *   grep -q '.*'
>    *   grep -q '.\+'
>    *   grep -q .
>    *   grep -qE '.*'
>    *   grep -qE '.+'
>    *   grep -qE .

No they don't. For example:

$ echo '' | grep -q . ; echo $?
1
$ echo '' | grep -q '.*' ; echo $?
0


The information transmitted, including any attachments, is intended only= for the person or entity to which it is addressed and may contain confiden= tial and/or privileged material. Any review, retransmission, dissemination = or other use of, or taking of any action in reliance upon, this information by persons or entities other tha= n the intended recipient is prohibited, and all liability arising therefrom= is disclaimed. If you received this in error, please contact the sender an= d delete the material from any computer.


In the event the content of this email includes Tax advice, the content = of this email is limited to the matters specifically addressed herein and i= s not intended to address other potential tax consequences or the potential= application of tax penalties to this or any other matter.


PricewaterhouseCoopers LLP is a Delaware limited liability partnership. = This communication may come from PricewaterhouseCoopers LLP or one of its s= ubsidiaries.


--_000_DM6PR19MB281215FDCF6E67868CB8AF25EF499DM6PR19MB2812namp_-- From unknown Fri Sep 05 08:56:38 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: "Bob Vincent Il (US)" Subject: bug#63819: closed (Re: bug#63819: Gnu `grep '.*'` does not match an empty string.) Message-ID: References: <9f737863-fbad-b673-930d-e5ccca682266@cs.ucla.edu> X-Gnu-PR-Message: they-closed 63819 X-Gnu-PR-Package: grep Reply-To: 63819@debbugs.gnu.org Date: Thu, 01 Jun 2023 03:16:02 +0000 Content-Type: multipart/mixed; boundary="----------=_1685589362-31135-1" This is a multi-part message in MIME format... ------------=_1685589362-31135-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #63819: Gnu `grep '.*'` does not match an empty string. which was filed against the grep package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 63819@debbugs.gnu.org. --=20 63819: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D63819 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1685589362-31135-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 63819-done) by debbugs.gnu.org; 1 Jun 2023 03:15:42 +0000 Received: from localhost ([127.0.0.1]:36602 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4Yms-00085h-5v for submit@debbugs.gnu.org; Wed, 31 May 2023 23:15:42 -0400 Received: from mail.cs.ucla.edu ([131.179.128.66]:57552) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4Ymn-00085N-FF for 63819-done@debbugs.gnu.org; Wed, 31 May 2023 23:15:40 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 5CE4A3C02213D; Wed, 31 May 2023 20:15:31 -0700 (PDT) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id pjA4IKcR_PCL; Wed, 31 May 2023 20:15:31 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id F03073C09FA06; Wed, 31 May 2023 20:15:30 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu F03073C09FA06 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1685589331; bh=oZUANNtgh1isX8G71F2VbGGZ2f+pZV4Ni0zE9tOVY3Q=; h=Message-ID:Date:MIME-Version:To:From; b=MFqZajc1xQZCrRTOx8YixBWSDeqJER/y0DZiuGjk03GuY/448ZkhAxGHYP5dvbX8u XRhjyltsbc8rruz4NFHSNru6NFsgZ7GdhVlMLIgB5HNlHnzCBiT6FwZamf/57p01PC mh3o9wNXGMj78vCR9MfeLUAqYmXoUPKoz8hGDJJiLsMbUqLZzf1ylXkfcGLSN5qNLr Q8PFWJjWGqL8d/QpxlR9dOCypHL/Xorf2sYgEavh9A3sPm4n/sB+H8eauJX8ndDsf2 MiQubluKvo9ZViZM05MP82r+blAP5U/WwATSc41WfXXZzKap3rtedm1hTfQ3XEY9XK U3znDlzRyF/Sg== X-Virus-Scanned: amavisd-new at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id vrSRI30rZ2oD; Wed, 31 May 2023 20:15:30 -0700 (PDT) Received: from [192.168.1.9] (cpe-172-91-119-151.socal.res.rr.com [172.91.119.151]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id CCF0A3C02213D; Wed, 31 May 2023 20:15:30 -0700 (PDT) Message-ID: <9f737863-fbad-b673-930d-e5ccca682266@cs.ucla.edu> Date: Wed, 31 May 2023 20:15:30 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: bug#63819: Gnu `grep '.*'` does not match an empty string. Content-Language: en-US To: "Bob Vincent Il (US)" References: <65bbc76f-cc20-7b78-8959-b24ccfb23596@cs.ucla.edu> From: Paul Eggert Organization: UCLA Computer Science Department In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.1 (-) X-Debbugs-Envelope-To: 63819-done Cc: 63819-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.1 (--) On 2023-05-31 19:17, Bob Vincent Il (US) wrote: > Okay, but `echo ''` does not output an empty string. It outputs a line feed character. The line feed is not considered. Grep looks only for matches of "any part of the line excluding the terminating " . Closing the bug report as it appears to be due to a misunderstanding of how 'grep' works. ------------=_1685589362-31135-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 31 May 2023 23:01:27 +0000 Received: from localhost ([127.0.0.1]:36504 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4Uom-0001U5-Lm for submit@debbugs.gnu.org; Wed, 31 May 2023 19:01:27 -0400 Received: from lists.gnu.org ([209.51.188.17]:51670) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4PTG-0006pb-6Y for submit@debbugs.gnu.org; Wed, 31 May 2023 13:18:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q4PTF-0007di-QT for bug-grep@gnu.org; Wed, 31 May 2023 13:18:49 -0400 Received: from mx08-00096706.pphosted.com ([91.207.212.192]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q4PTA-0006vl-0w for bug-grep@gnu.org; Wed, 31 May 2023 13:18:49 -0400 Received: from pps.filterd (m0240461.ppops.net [127.0.0.1]) by mx07-00096706.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34VH3Xap027922 for ; Wed, 31 May 2023 17:18:34 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pwc.com; h=from : to : subject : date : message-id : content-type : mime-version; s=Gtwy2-05132021-ehtnJT9NLo6C; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=fHmoU9ph7gkORKvilu8jxxAvQCZrssGLblGRkddc8Ttfu2HLLO5SEfgMx09TpbIlyapH SJ7nFC/kaROqc9I9J7xxKa5aOlgNR3eIjqGyhZwF+MsjLvkrzAdwdQLwUi8tXDM/qctp r1a+62v/mJQ39mPD/38/rRCMh8/Xlyp4VtsiQS9/9SG02aBJ5YIlnZ/eYjZZ8xNOVnuh mnauygLFm++oToO/4f7pqhVZy9Um9k3FKmU63Y7jFf7fgw6BV7jT96ZqQkVUP9LZpP70 YogOELIBox69D92GTikQ+vc4HrDU3PeUyNdsO21+Xboj69Ok/bMwM/OcWaC1aFS+4WBG Cg== Received: from nam12-bn8-obe.outbound.protection.outlook.com (mail-bn8nam12lp2174.outbound.protection.outlook.com [104.47.55.174]) by mx07-00096706.pphosted.com (PPS) with ESMTPS id 3qxaa6g724-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Wed, 31 May 2023 17:18:33 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XKuBxwh94bERpSh5YiWAl13EXxyXt/gSevLdRPeR1Mk2YIkE+co99DopEJumWGiCAwoDIjho0PLfNGM5FIDu21xOoZK0vWV7ltsSRYDKpcOCnq7S3tWtjBx4VD/N4/WhoTY2380pgzD4SPYmMceKIrMnNPKnqsXh7AGrXec3PQ/9WQYBUAJcX7r4g3WrjsMm+LVGsJ1gUZkJF7rZIg+iQznNQf5IYGzdSEhxatuj+7DxcYT8s2JiG5XjvWri7rPBnHRrXf0Ms/QIYtY0+ZvSD5HhGQnrNbim8xQPdcs9lZ1eRrGtQ+7JzCACMl/KfCqKab+LY7PfIAOM7NNX6oEt8g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=WzBJvToxXI8zB2aMMnFddOE9Bl73xuCu4foXf6N5nB5AWBbt9yuPHmngsYgNcPiAPL274OdWwaKqAplOrT4ATZOPiBHIs2FTYY98HoxKXCicAA/7IHsXPP1tZJ6j1mIaQHu/CWN5xkklqpprzT2sZf8hyEDlNjbELRbPgpOTkF5ny7Hgvefl3SlNkhAzqXmKY/a/B4RqfJalS+hHVKLeqvFyuCF/JvmPEv8quAGWzd29XVrfuwzY8QaHBUU1wc6wzxea+KqPeQ2VBnAt8zzirBLYOeXOVuGsds1zGVFOZLxdPcrit9Jy0i2coMz4vBpsJfg3i74NUFkWZB8dtqwUnA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=pwc.com; dmarc=pass action=none header.from=pwc.com; dkim=pass header.d=pwc.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pwc.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=FmU8OIelOJf4HvIESLXIF4oUVFlK3lug1tMuqedjVos=; b=PcuyHse9vt+INjmWVK8yCVzhUxkat0Cfljp1J38CxU0fnBGNF7C2oidRuewnDSdv5jbZY7bOTobfO3FvLaq73Zao37M2oda2nHhMwC5e8UIYvnUYlVIOzfI+SCMYz6kzAiSQSO6+L/0cQN1gLz6oasoULkkKQJyjBTZxu2uCecY= Received: from DM6PR19MB2812.namprd19.prod.outlook.com (2603:10b6:5:13b::20) by BL1PR19MB5939.namprd19.prod.outlook.com (2603:10b6:208:39a::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6477.7; Wed, 31 May 2023 17:18:30 +0000 Received: from DM6PR19MB2812.namprd19.prod.outlook.com ([fe80::7443:6237:454c:2994]) by DM6PR19MB2812.namprd19.prod.outlook.com ([fe80::7443:6237:454c:2994%7]) with mapi id 15.20.6455.020; Wed, 31 May 2023 17:18:30 +0000 From: "Bob Vincent Il (US)" To: "bug-grep@gnu.org" Subject: Gnu `grep '.*'` does not match an empty string. Thread-Topic: Gnu `grep '.*'` does not match an empty string. 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envelope-from=robert.a.vincent.ii@pwc.com; helo=mx08-00096706.pphosted.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.163, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, URI_NOVOWEL=0.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -0.9 (/) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Wed, 31 May 2023 19:01:23 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.9 (-) --_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I discovered only today that the following commands all behave identically: * grep -q '.*' * grep -q '.\+' * grep -q . * grep -qE '.*' * grep -qE '.+' * grep -qE . Gnu grep documentation says: The period =91.=92 matches any single character. It is unspecified whether = =91.=92 matches an encoding error. and =91*=92 The preceding item is matched zero or more times. I would think that an empty string matches "zero or more of any single char= acter". Can anyone point out where the documentation says otherwise? Bob Vincent (US) PwC IT - NGC - PUPPET DEV OPS | Senio= r Manager Work: 906-984-3549 Mobile: 770-744-1792 PricewaterhouseCoopers LLP @workday @githu= b @ServiceNow ________________________________ The information transmitted, including any attachments, is intended only fo= r the person or entity to which it is addressed and may contain confidentia= l and/or privileged material. Any review, retransmission, dissemination or = other use of, or taking of any action in reliance upon, this information by= persons or entities other than the intended recipient is prohibited, and a= ll liability arising therefrom is disclaimed. If you received this in error= , please contact the sender and delete the material from any computer. In the event the content of this email includes Tax advice, the content of = this email is limited to the matters specifically addressed herein and is n= ot intended to address other potential tax consequences or the potential ap= plication of tax penalties to this or any other matter. PricewaterhouseCoopers LLP is a Delaware limited liability partnership. Thi= s communication may come from PricewaterhouseCoopers LLP or one of its subs= idiaries. ________________________________ --_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I discovered only today that the following c= ommands all behave identically:
  • grep -q '.*'
  • grep -q '.\+'
  • grep -q .
  • grep -qE '.*'
  • grep -qE '.+'
  • grep -qE .
Gnu grep documentation says:

The period =91.=92 matches any single character. It is unspecified whether =91.and
=91*<= /span>=92<= /dt>

The preceding item is ma= tched zero or more times.


I would think that an empty string matches &= quot;zero or more of any single character".

Can anyone point out where the documentation= says otherwise?



The information transmitted, including any attachments, is intended only= for the person or entity to which it is addressed and may contain confiden= tial and/or privileged material. Any review, retransmission, dissemination = or other use of, or taking of any action in reliance upon, this information by persons or entities other tha= n the intended recipient is prohibited, and all liability arising therefrom= is disclaimed. If you received this in error, please contact the sender an= d delete the material from any computer.


In the event the content of this email includes Tax advice, the content = of this email is limited to the matters specifically addressed herein and i= s not intended to address other potential tax consequences or the potential= application of tax penalties to this or any other matter.


PricewaterhouseCoopers LLP is a Delaware limited liability partnership. = This communication may come from PricewaterhouseCoopers LLP or one of its s= ubsidiaries.


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