From debbugs-submit-bounces@debbugs.gnu.org Thu Mar 26 11:29:43 2020 Received: (at submit) by debbugs.gnu.org; 26 Mar 2020 15:29:43 +0000 Received: from localhost ([127.0.0.1]:59503 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jHURz-00073n-94 for submit@debbugs.gnu.org; Thu, 26 Mar 2020 11:29:43 -0400 Received: from lists.gnu.org ([209.51.188.17]:34336) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jHTLJ-00059l-9K for submit@debbugs.gnu.org; Thu, 26 Mar 2020 10:18:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35293) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jHTLH-0006K6-S8 for bug-sed@gnu.org; Thu, 26 Mar 2020 10:18:45 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,FREEMAIL_FROM, HTML_MESSAGE,URIBL_BLOCKED autolearn=disabled version=3.3.2 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jHTLG-0003Zx-NU for bug-sed@gnu.org; Thu, 26 Mar 2020 10:18:43 -0400 Received: from mail-wm1-x32c.google.com ([2a00:1450:4864:20::32c]:36545) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jHTLG-0003Yo-C3 for bug-sed@gnu.org; Thu, 26 Mar 2020 10:18:42 -0400 Received: by mail-wm1-x32c.google.com with SMTP id g62so7221026wme.1 for ; Thu, 26 Mar 2020 07:18:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=5v4sFLDb/5r7/EC6Tr+BWuI2l7PBlGMPBcSxhm0CnCA=; b=Cx6lqNuxucSSFl0L882hLzsZ2cOGZDYZrn8BB7+hLR4YRN/lHUtpjuCZ4DaY+Ue5wr oujcuB8TTJi6zvhDUW5/MfwsN7sBzi3yoL+ss9O/Vv+6oAjlZ6Mj2eAeOINt+9LZQZEE qOH/VoB7Gfs2elHU2HT4BooP4QvSsgJsbwBGlV+1YWBI5qmvMnhlHNJkpGIqOPgizVDu U3ma2eJVWiXhBwgZ5uA3Dh3ivX6p335DTQRdT5+JbHTMgWZvgySAl5CJd7MZLj/Qaq7w W4NzBcfmIAxxy9zIv9FhXX2ofZ+t3VnnIVT/pN/v3H1dLhw8GRxLKbQIdXPup0pFt9HK VGqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=5v4sFLDb/5r7/EC6Tr+BWuI2l7PBlGMPBcSxhm0CnCA=; b=YhlBp+nY+xO3f8nnw62naDMdeWoB1KGuW1Y4x8G+3XxZUuOg9QUoDcBwz9dzOpg1pz 1GLsuIBMDBvenKTNdqCSjsNnCeOUY27tZO9iVa9MuiHJRojdLcLmLLMRgj+hmQTnMnRb kL6II2lC1SzKR3U8l89MXYIZBtCWJ1CRXRcM+UjNH+Vvo+J5sIZdBtC3Uyz7HTXzIU3t qHzfoYs1BiqvN8D02p1GEY3FEYsV/XHBky6UPn7kkIK31P6RgZXtZuPggSF658wcpu3g 4RIS76sVVveDojRdG9GE429a9wAp9CpcScg6n5nmpHwo7wRs6Ib/9hl6gh9pdEC1mTbH tz9Q== X-Gm-Message-State: ANhLgQ3TpM+mIU+8p/OECY0MyQ5LNwM6VRv6m7CzQkcqQpXH3SAqbLJh u5IB+bGFXuBiKMI6mBxpdlAfJWC0Et9cmHOm50f7BhOP X-Google-Smtp-Source: ADFU+vvun/TxwVO/p5g3Tx8c9Iiixv36oyahg1iDHZ8cB+Mx5LXmVzc439+BmmIkjovSBhkfwDD94a+VED2AbYErGQ8= X-Received: by 2002:a05:600c:54f:: with SMTP id k15mr200237wmc.76.1585232319781; Thu, 26 Mar 2020 07:18:39 -0700 (PDT) MIME-Version: 1.0 From: Enrico Maria De Angelis Date: Thu, 26 Mar 2020 14:18:28 +0000 Message-ID: Subject: Bug in how \cregexpc is handled To: bug-sed@gnu.org Content-Type: multipart/alternative; boundary="0000000000004ea02f05a1c2a9e8" X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::32c X-Spam-Score: 0.3 (/) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Thu, 26 Mar 2020 11:29:42 -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: -0.7 (/) --0000000000004ea02f05a1c2a9e8 Content-Type: text/plain; charset="UTF-8" To whom it may concern, >From man sed, I read: \cregexpc Match lines matching the regular expression regexp. The c may be any character. On the one hand - sed '\cncd' <<< n correctly shows empty output, since it's the same as sed '/n/d' <<< n based on the description above; - sed '\c\ccd' <<< c correctly shows an empty output too, but in this case the letter needed to be escaped for obvious reasons. On the other hand: - sed '\n\nnd' <<< n results in an output equal to the single character n, revealing that the backslash is having a double effect: 1. it prevents the following n from closing the opening \n. 2. it interprets the n as a newline instead of the literal letter n; this is confirmed by executing echo -e 'a\na' | sed -n 'N;\n\nnp'. The is means that using n in \nregexpn prevevents the use of the literal n in the regexp. The issue has come to light in this StackOverflow question. Kind regards, Enrico Maria De Angelis --0000000000004ea02f05a1c2a9e8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
To whom it may concern,

From man sed, I read:
=C2=A0 = =C2=A0 =C2=A0 =C2=A0\cregexpc
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 Match lines matching the regular expression regexp.=C2=A0 The c may = be any character.
On = the one hand
  • sed '\cn= cd' <<< n=C2=A0correct= ly shows empty output, since it's the same as=C2=A0sed '/n/d' <<< n based on the descripti= on above;
  • sed '\c\ccd' <<<= ; c correctly shows an empty output too, but in this case the letter= needed to be escaped for obvious reasons.
=C2=A0On the other hand= :
  • sed '\n\nnd' <<< n results in an output equal to the single character n, revealing that the backslash is having a double effect:
  • it prevents the following n from clos= ing the opening \n.
  • it interprets t= he n as a newline instead of the literal le= tter n; this is confirmed by executing=C2= =A0echo -e 'a\na' | sed -n 'N;\n\nnp&#= 39;.
The is means that using = n in \nregexpn prevevents=C2=A0the u= se of the literal n in the regexp.

The issue has come to = light in this StackOverflow question.

Kind regards,
Enrico Maria De Angelis
--0000000000004ea02f05a1c2a9e8-- From debbugs-submit-bounces@debbugs.gnu.org Tue Mar 31 00:47:12 2020 Received: (at 40239) by debbugs.gnu.org; 31 Mar 2020 04:47:12 +0000 Received: from localhost ([127.0.0.1]:35383 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jJ8nw-0001pN-5Y for submit@debbugs.gnu.org; Tue, 31 Mar 2020 00:47:12 -0400 Received: from mail-pj1-f41.google.com ([209.85.216.41]:36435) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jJ8nu-0001p3-3i; Tue, 31 Mar 2020 00:47:10 -0400 Received: by mail-pj1-f41.google.com with SMTP id nu11so561999pjb.1; Mon, 30 Mar 2020 21:47:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=ojJ9QCLFwHOSpAcOAyLAEFVjmhrnpR+EFgnq2epfkF4=; b=XnMVrj1N0JdlZYHuEGtOJnH0P/MyWkXWVbiikEEI7voiS0OVIWvGp7Q4gqbnChoCas XAbRFsAXj1dhYhAJK3ayZT1LYcr1+koomyV8ZUEBTglism6n5rQTI7A5Qo8VkaGuUCou SLgIwXsd8DhyZfjZZhuExot5YFFHbPt0JWotqHQ2A5TsXXJfJtml8T6l0HEcMt5jsPQ4 WJsppR11IwO1oP6/oOgxMHKy6zzCOuo4RiqIdM3VcrOiRJgLDNcgi7lJNzPYTRYHQpjK Dr49TAIl66gNOzujinM7RIi2uhRtUeGV62Xjxr6IV++868/Jv0/I4feUq0oZ4S3iZYPS laGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=ojJ9QCLFwHOSpAcOAyLAEFVjmhrnpR+EFgnq2epfkF4=; b=AGIcnQIbel2QZemOfgCN2gV17mPmKXuLLzsGJeyomtQ/UJ8s899fCTv+xMSXyirBPN 1N1ojwbv2dGwBOF3nuFUNmsRi3smfoxKdHpC1ydGC41rmrkM5U5LyC2QnMplfbMMjrdH 0qlI76LM22cD9E9fdC54A7ZFLZ5TNrGUN2pwTO3GbQBDtkgJqSqjURcjN9yAf77ec67h BMrDrUOtE9tTSbw5u46fkszykHDHzzEr+3dbNJseDcqRW5iC/xsmUteC1BvKQTeFYwcW kkLuoclQvRrRjLBnALSaEsuQM4rLUqNR0gee6OMbIZN8tCOgdb06OHlKbEbeBUyI51ds 4+jQ== X-Gm-Message-State: AGi0PuYjAZtNab59g3RQhCXlg0mSgsMGV/Brx7axdpMgrzqq9K+dxvD3 Yu8tkCt50bGc6v3LGE/WkNPqLYF2 X-Google-Smtp-Source: APiQypK4DBGx/9t588UpwRpMTMICv5So2EJwMUKCLTK8Bc/c+V6JdCAa7zp8eePcP5jEWZQqcLQ3pA== X-Received: by 2002:a17:90a:cb18:: with SMTP id z24mr1678868pjt.67.1585630023642; Mon, 30 Mar 2020 21:47:03 -0700 (PDT) Received: from tomato.moose.housegordon.com (moose.housegordon.com. [184.68.105.38]) by smtp.googlemail.com with ESMTPSA id t186sm10659038pgd.43.2020.03.30.21.47.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2020 21:47:02 -0700 (PDT) Subject: Re: bug#40239: Bug in how \cregexpc is handled To: Enrico Maria De Angelis , 40239@debbugs.gnu.org References: From: Assaf Gordon Message-ID: Date: Mon, 30 Mar 2020 22:47:01 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 40239 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: -1.0 (-) merge 40239 40242 stop Hello, On 2020-03-26 8:18 a.m., Enrico Maria De Angelis wrote: [...] > The is means that using n in \nregexpn prevevents the use of the literal n > in the regexp. > > The issue has come to light in this StackOverflow > > question. Thank you for the report. The original poster (Oguz Ismail) sent a similar issue, please see the reply there: http://debbugs.gnu.org/40242 regards, - assaf From debbugs-submit-bounces@debbugs.gnu.org Tue Mar 31 00:47:44 2020 Received: (at control) by debbugs.gnu.org; 31 Mar 2020 04:47:44 +0000 Received: from localhost ([127.0.0.1]:35386 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jJ8oS-0001qW-JT for submit@debbugs.gnu.org; Tue, 31 Mar 2020 00:47:44 -0400 Received: from mail-pl1-f179.google.com ([209.85.214.179]:44632) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jJ8oP-0001qH-Ry for control@debbugs.gnu.org; Tue, 31 Mar 2020 00:47:42 -0400 Received: by mail-pl1-f179.google.com with SMTP id h11so7644050plr.11 for ; Mon, 30 Mar 2020 21:47:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:from:message-id:date:user-agent:mime-version:content-language :content-transfer-encoding; bh=w1B8uD2bucppmC+14k3BZQ9q6Bq8v3XYrQdyEm1uBi0=; b=jYB23K3oM2rixRBsKMwIAPl2oCtP0v0oN2j/Jxa535CWj4avINBJEDG5T/LrcOsQFV EMWaxHyMv25UxysUptpjJbwxvf/9CFJAzdElEfNJQhluRiJIh9jHJCCXVtyzFJrVg4O0 yh1tPHCaxkOk995Atros701Gj/L2Sdpp6fpc/nhIW79mc16AUj0Q6Ng0s1z23AdILlcQ qMhc9Mf8LFYf2DJt/gs3KFgflavl+6FiZpktVmG2GHCjCd+oKt+gsJZNkQNPPvMOCuIy CBw+GqL5YzgqwbqD3Xb1zqkNjpukHkWh/z1snnWVyCrJXF0kifyCazOeEcozU0bc4/y0 H0Qw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:from:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=w1B8uD2bucppmC+14k3BZQ9q6Bq8v3XYrQdyEm1uBi0=; b=sIGnHMcTpW2vCw1JGm+Co4FAhPMK8U7cD1T3boi8VIcv1dip3DTbIvoV0DRm4jcKbn WXBAY7aVrimo2yjgENMqumsNrM2RJhaCsz/1Wxqbu2ycOhbwzkqRdvcAQ/gbQCJMwR0R ovTnJ5VqHnA9rsiU3ytDLcApct8BIZNN63WfCxDKyMGYhVOyOAz4CY9K7+RZpnfUESY/ aa9nX3x/vYZEcaKiQPj8be/N+KXYyEvdIMBYh7TBATq3ErfufN+E0fcKVnNc8aYQFzhr z0eTsGVihvfNwLJuK7w7CU0I2MQr9op6UccOaHnaXd7frjCHKu4AZMvCYseQSjrYzRlN CDGQ== X-Gm-Message-State: AGi0Pub4tqoZgu7TkjRQWb6yH62W3kOS/+0/Mw1vZVrFn8fgAKYPGNaV ccPni/Kbx9BSKTPMdGDnRBT0WFN5 X-Google-Smtp-Source: APiQypKJ/8++o8JEupLZ/7Rf9ZnEDZMRN8+r7goHQ5Lu3B5v/lVls3irBJkAZDKQ4Gcc88FYSg0N5Q== X-Received: by 2002:a17:90a:7182:: with SMTP id i2mr1718750pjk.74.1585630055561; Mon, 30 Mar 2020 21:47:35 -0700 (PDT) Received: from tomato.moose.housegordon.com (moose.housegordon.com. 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