From unknown Mon Aug 18 00:08:06 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#63819 <63819@debbugs.gnu.org> To: bug#63819 <63819@debbugs.gnu.org> Subject: Status: Gnu `grep '.*'` does not match an empty string. Reply-To: bug#63819 <63819@debbugs.gnu.org> Date: Mon, 18 Aug 2025 07:08:06 +0000 retitle 63819 Gnu `grep '.*'` does not match an empty string. reassign 63819 grep submitter 63819 "Bob Vincent Il (US)" severity 63819 normal thanks From debbugs-submit-bounces@debbugs.gnu.org Wed May 31 19:01:27 2023 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.


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--_000_BN8PR19MB28038973B2BF7CC918216A5EEF409BN8PR19MB2803namp_-- From debbugs-submit-bounces@debbugs.gnu.org Wed May 31 20:42:55 2023 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 Subject: Re: bug#63819: Gnu `grep '.*'` does not match an empty string. Content-Language: en-US To: "Bob Vincent Il (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-Debbugs-Envelope-To: 63819 Cc: 63819@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 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 debbugs-submit-bounces@debbugs.gnu.org Wed May 31 22:17:27 2023 Received: (at 63819) by debbugs.gnu.org; 1 Jun 2023 02:17:27 +0000 Received: from localhost ([127.0.0.1]:36586 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4XsV-0006bK-0t for submit@debbugs.gnu.org; Wed, 31 May 2023 22:17:27 -0400 Received: from mx07-00096706.pphosted.com ([185.132.181.231]:53420) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q4XsR-0006bA-GR for 63819@debbugs.gnu.org; Wed, 31 May 2023 22:17:25 -0400 Received: from pps.filterd (m0240472.ppops.net [127.0.0.1]) by mx07-00096706.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34VMVaNE010085; Thu, 1 Jun 2023 02:17:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pwc.com; h=from : to : cc : subject : date : message-id : references : in-reply-to : content-type : mime-version; s=Gtwy2-05132021-ehtnJT9NLo6C; bh=Qz1pbMS3eUy0V6GF6DE2RL4DIzfOq/fDT2CaC+89NXY=; b=ADFi3QrJF0ZlgosbEXTVByVuJS5cYOIPT1TALrOKolRLzgzwXf7u/3T0nMYsIaA6Tq4B Vfcqr84fc5VTQJ776/Q7rGqFyArkvkOW5FkoTBAxXv4bmJOqxpTFGGYgwaUy6lzJJdcD YUvDU0CUV/rjGxEsNHeYcP+Lq+WBD7eILcOrcvUvo4CLsc/VhpsSPC4cR49GLfdFigVR AEkzPKvlbcAsM/1+gp8BvyZoaK/0dEEGF2NBpZ3q9XxBJGzCBOPoWgT8vijOC+FWvg4F Kwi1qJQ46u8VE8dBqi3owY1kd9j2WsVqnnz1TkGqdW78SOl/LY8fuI0WQ996UluGpsJz lA== Received: from nam10-mw2-obe.outbound.protection.outlook.com (mail-mw2nam10lp2104.outbound.protection.outlook.com [104.47.55.104]) by mx07-00096706.pphosted.com (PPS) with ESMTPS id 3qxdtyafw6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 01 Jun 2023 02:17:13 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Wj9dkQZ3l32paG6eDL+Cpwnka1OqBUrNJ2VTz5JedsJAkbK68OxHbdQKEfwEKHrV3J4rzNCdWGaWMmaHi44sujuAKgHuVRYBptGl7RWG1Xk/VbyDo6uYDDMwPdnVaEL1C/TXvLNJNLVyVR2I1Eks4HX+w9fnqwNaAshKXEDxlDM6ANh37hZxzHf+dVAELAF1Y44XaN5b1B9l6ybV2mArTRIpVGpl0Sj2tCRuFE9WQY9uHQzDPWUYxFpHLuoBI2hQrPP3JD4rLK7BIWVoSya2uDIuxiDtd+5p3biMDMx4OXBSuHPFERoBsc/P4t08Bos/MuKe2479kvtpLgiY5zoP+Q== 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=Qz1pbMS3eUy0V6GF6DE2RL4DIzfOq/fDT2CaC+89NXY=; b=MYkRWRKWdJWthzxG8duk3bq1qyPyY5IQ0DdZojRa+1nwvZDXEgihDtsZDLPZYHHqb1VFblfpxoB2qLpYnIAmYVS+dzlqJ9wCPD42KWdZVUOCkdQVYCvkbK4rE0pOh017BmNwRlkeapy4/5KwIj7dTzHtg7aAxAF0Cwk0PKTsfiM1WG4YXGwDF7yxMZgnYn+yKFftoK3qjdfGG5bTTfK8hXQLjk6Oe51g1un0gkAT68KokzivuapDWzrkPPUndNWjzWeb7GDteVN7NBwH9p5eGKlLqcdmHOfpFKjkNE/fbpIOByZGAWPt3xqGE1eZPwuRaqkiW8feSkb1WSNPT1K4Aw== 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=Qz1pbMS3eUy0V6GF6DE2RL4DIzfOq/fDT2CaC+89NXY=; b=Q3DCefwi1KOUUn51yZkTbUnxB7quGc4FIFv+gvnt+a4bzd0G95VOjpBtfls7fKiU/9p3NzNb2rGishYb29ZdRb93CtwFzyWG9G9biE2B3fS8Nm7j/QMEix3g6N+TEs92TlVAe1wo3tBr0F+I1Fs0WLxe1Q+vcf2M6ZpIw/w9VNk= Received: from DM6PR19MB2812.namprd19.prod.outlook.com (2603:10b6:5:13b::20) by PH7PR19MB5990.namprd19.prod.outlook.com (2603:10b6:510:1dd::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6455.21; Thu, 1 Jun 2023 02:17:08 +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; Thu, 1 Jun 2023 02:17:07 +0000 From: "Bob Vincent Il (US)" To: Paul Eggert Subject: Re: 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 debbugs-submit-bounces@debbugs.gnu.org Wed May 31 23:15:42 2023 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. From unknown Mon Aug 18 00:08:06 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Thu, 29 Jun 2023 11:24:06 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator