Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 40239) by debbugs.gnu.org; 31 Mar 2020 04:47:12 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Mar 31 00:47:12 2020 Received: from localhost ([127.0.0.1]:35383 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1jJ8nw-0001pN-5Y for submit <at> 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 <assafgordon@HIDDEN>) 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 <enricomaria.dean6elis@HIDDEN>, 40239 <at> debbugs.gnu.org References: <CAO_nHykcJj8yBCOJ+s4gWBfbWBkHz2jnyGWeVN=4+k0ss-zxWQ@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <f8e182b0-c674-50e6-0209-08c84c7318b2@HIDDEN> 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: <CAO_nHykcJj8yBCOJ+s4gWBfbWBkHz2jnyGWeVN=4+k0ss-zxWQ@HIDDEN> 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 <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: -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 > <https://stackoverflow.com/questions/60853746/what-is-n-nnd-supposed-to-do> > 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
bug-sed@HIDDEN:bug#40239; Package sed.
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From: Enrico Maria De Angelis <enricomaria.dean6elis@HIDDEN>
Date: Thu, 26 Mar 2020 14:18:28 +0000
Message-ID: <CAO_nHykcJj8yBCOJ+s4gWBfbWBkHz2jnyGWeVN=4+k0ss-zxWQ@HIDDEN>
Subject: Bug in how \cregexpc is handled
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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
<https://stackoverflow.com/questions/60853746/what-is-n-nnd-supposed-to-do>
question.
Kind regards,
Enrico Maria De Angelis
--0000000000004ea02f05a1c2a9e8
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<div dir=3D"ltr">To whom it may concern,<div><br></div><div>From <font face=
=3D"monospace">man sed</font>, I read:<div><font face=3D"monospace">=C2=A0 =
=C2=A0 =C2=A0 =C2=A0\cregexpc<br>=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.</font><br></div><div><font face=3D"arial, sans-serif">On =
the one hand</font></div><div><ul><li><font face=3D"monospace">sed '\cn=
cd' <<< n</font><font face=3D"arial, sans-serif">=C2=A0correct=
ly shows empty output, since it's the same as=C2=A0</font><font face=3D=
"monospace">sed '/n/d' <<< n</font> based on the descripti=
on above;</li><li><font face=3D"monospace">sed '\c\ccd' <<<=
; c</font> correctly shows an empty output too, but in this case the letter=
needed to be escaped for obvious reasons.</li></ul>=C2=A0On the other hand=
:<ul><li><font face=3D"monospace">sed '\n\nnd' <<< n</font=
> results in an output equal to the single character <font face=3D"monospac=
e">n</font>, revealing that the backslash is having a double effect:</li><o=
l><li>it prevents the following <font face=3D"monospace">n</font> from clos=
ing the opening <font face=3D"monospace">\n</font>.</li><li>it interprets t=
he <font face=3D"monospace">n</font> as a newline instead of the literal le=
tter <font face=3D"monospace">n</font>; this is confirmed by executing=C2=
=A0<font face=3D"monospace">echo -e 'a\na' | sed -n 'N;\n\nnp&#=
39;</font>.</li></ol></ul>The is means that using <font face=3D"monospace">=
n</font> in <font face=3D"monospace">\nregexpn</font> prevevents=C2=A0the u=
se of the literal <font face=3D"monospace">n</font> in the <font face=3D"mo=
nospace">regexp</font>.<br></div><div><br></div><div>The issue has come to =
light in this <a href=3D"https://stackoverflow.com/questions/60853746/what-=
is-n-nnd-supposed-to-do">StackOverflow</a> question.</div><div><br></div><d=
iv>Kind regards,</div><div>Enrico Maria De Angelis</div></div></div>
--0000000000004ea02f05a1c2a9e8--
Enrico Maria De Angelis <enricomaria.dean6elis@HIDDEN>:bug-sed@HIDDEN.
Full text available.bug-sed@HIDDEN:bug#40239; Package sed.
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