From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 24268 invoked from network); 2 Mar 2023 18:55:05 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 2 Mar 2023 18:55:05 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 068C743BFC; Fri, 3 Mar 2023 04:55:02 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuhs.org; s=dkim; t=1677783302; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:list-id:list-help:list-owner: list-unsubscribe:list-subscribe:list-post; bh=k+qKIVmLr8lMNJ5gIYkVX9RYfDFU/HN+eJf5k0omY5Y=; b=o4etLrC4M0lmqx0K673lxVUo+LPQiC1jetU4Sxne/0KtCJjnVgTJ0rG8drvM2NDy3q0W1o N5hCAyyvCEAq9aIESx49EnhPAjN5nApizGwD1dkW8tNaJNICAh99QNSFQmCMYwRqKo24CQ F437+zwRfosdujQ829Gfr9J68HtFk1I= Received: from tncsrv06.tnetconsulting.net (tncsrv06.tnetconsulting.net [IPv6:2600:3c00:e000:1e9::8849]) by minnie.tuhs.org (Postfix) with ESMTPS id CF9DD43788 for ; Fri, 3 Mar 2023 04:54:56 +1000 (AEST) Received: from Contact-TNet-Consulting-Abuse-for-assistance by tncsrv06.tnetconsulting.net (8.15.2/8.15.2/Debian-3) with ESMTPSA id 322IstLU026248 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Thu, 2 Mar 2023 12:54:55 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tnetconsulting.net; s=2019; t=1677783295; bh=k+qKIVmLr8lMNJ5gIYkVX9RYfDFU/HN+eJf5k0omY5Y=; h=To:From:Subject:Message-ID:Date:User-Agent:MIME-Version: Content-Type:Cc:Content-Disposition:Content-Language: Content-Transfer-Encoding:Content-Type:Date:From:In-Reply-To: Message-ID:MIME-Version:References:Reply-To:Resent-Date: Resent-From:Resent-To:Resent-Cc:Sender:Subject:To:User-Agent; b=TsS4WbhWOlmReeJhHpbEvmzot7/JpGp0dp24qSiuIQ2sCvrP42k0sqiLqqVeG4MLE i2Lk3igKSQMqXp7+ohz5TgnWGNBDdVS+3+AAf9hmNzYvYXKx+0ZoEv/sed5YndbwoU o0xGPnylOsGEnZuJ9D4WpRTEZQEhe6eZdc1r9LNU= To: COFF Organization: TNet Consulting Message-ID: <8d1de5c8-1f34-3d37-395d-0f1da7b062ec@spamtrap.tnetconsulting.net> Date: Thu, 2 Mar 2023 11:54:49 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms010000070206040905060404" Message-ID-Hash: 37KQLZZMYB3RUZKMG2KPDQLGGWTBQB54 X-Message-ID-Hash: 37KQLZZMYB3RUZKMG2KPDQLGGWTBQB54 X-MailFrom: gtaylor@tnetconsulting.net X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Requesting thoughts on extended regular expressions in grep. List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Grant Taylor via COFF Reply-To: Grant Taylor This is a cryptographically signed message in MIME format. --------------ms010000070206040905060404 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi, I'd like some thoughts ~> input on extended regular expressions used=20 with grep, specifically GNU grep -e / egrep. What are the pros / cons to creating extended regular expressions like=20 the following: ^\w{3} vs: ^(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) Or: [ :[:digit:]]{11} vs: ( 1| 2| 3| 4| 5| 6| 7| 8|=20 9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31)=20 (0|1|2)[[:digit:]]:(0|1|2|3|4|5)[[:digit:]]:(0|1|2|3|4|5)[[:digit:]] I'm currently eliding the 61st (60) second, the 32nd day, and dealing=20 with February having fewer days for simplicity. For matching patterns like the following in log files? Mar 2 03:23:38 I'm working on organically training logcheck to match known good log=20 entries. So I'm *DEEP* in the bowels of extended regular expressions=20 (GNU egrep) that runs over all logs hourly. As such, I'm interested in=20 making sure that my REs are both efficient and accurate or at least not=20 WILDLY badly structured. The pedantic part of me wants to avoid=20 wildcard type matches (\w), even if they are bounded (\w{3}), unless it=20 truly is for unpredictable text. I'd appreciate any feedback and recommendations from people who have=20 been using and / or optimizing (extended) regular expressions for longer = than I have been using them. Thank you for your time and input. --=20 Grant. . . . unix || die --------------ms010000070206040905060404 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC CzowggUiMIIECqADAgECAhEAw8IZWQHDVuWWKHZeojBgoDANBgkqhkiG9w0BAQsFADCBljEL MAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2Fs Zm9yZDEYMBYGA1UEChMPU2VjdGlnbyBMaW1pdGVkMT4wPAYDVQQDEzVTZWN0aWdvIFJTQSBD bGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0yMjExMTQwMDAw MDBaFw0yMzExMTQyMzU5NTlaMCsxKTAnBgkqhkiG9w0BCQEWGmd0YXlsb3JAdG5ldGNvbnN1 bHRpbmcubmV0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzOnBjTJUlBTzN81c PlYErJc9kEbTI/hXq0NA6ZoG4VM6puYTEXtITANjgX+NRwwHjldESnC8dvh6Mx5ckEk9sWoD l8Yr/dWhF3s4fGxAX5ziOeuBI/yX7rKJn6DOwclV3C6dyt3zrLB6LOiF4gA+lk/o3EbOwoPh 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