GNU bug report logs - #29613
Debian Bug#883733: grep returns 0 even if there is no match

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Package: grep; Reported by: "Santiago R.R." <santiagorr@HIDDEN>; dated Fri, 8 Dec 2017 11:12:02 UTC; Maintainer for grep is bug-grep@HIDDEN.

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Subject: Re: bug#29613: Debian Bug#883733: grep returns 0 even if there is no
 match
To: "Santiago R.R." <santiagorr@HIDDEN>
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On Fri, Dec 8, 2017 at 3:11 AM, Santiago R.R. <santiagorr@HIDDEN> wrote:
> Dear grep developers,
>
> I would like to forward the report below, filed by Mathias Pietsch to
> Debian. I don't want to introduce other noise than this:
>
> $ echo 1111111111111 | grep -E '^1?$' ; echo $?
> 1
> $ echo 1111111111111 | grep -E '^(11+)\1+$' ; echo $?
> 1
> $ echo 1111111111111 | grep -E '^(11+)\1+$|^1?$' ; echo $?
> 1111111111111
> 0
>
> Shouldn't the last grep command exit 1 too?
>
> Cheers,
>
>  -- Santiago
>
> ----- Forwarded message from Mathias Pietsch <m.pietsch@HIDDEN> -----
>
> Date: Wed, 6 Dec 2017 23:51:52 +0100
> From: Mathias Pietsch <m.pietsch@HIDDEN>
> To: Debian Bug Tracking System <submit@HIDDEN>
> Subject: Bug#883733: grep returns 0 even if there is no match
> X-Mailer: reportbug 7.1.7
>
> Package: grep
> Version: 2.27-2
> Severity: normal
> Tags: upstream
>
> when trying to test this famous regexp for matching non-prime numbers
> (^1?$|^(11+?)\1+$) which works fine with 'grep -P', i wondered if it
> also would work without the non-greedy quantifier so egrep or even
> plain grep could use it, and found the following problem e.g., with the
> prime number 13:
>
> $ echo "1111111111111" | grep -E '^(11+)\1+$|^1?$' || echo prime
> 1111111111111
>
> the expected output would have been 'prime' because '1111111111111'
> doesn't match '^1?$' and is also no concatanation of two or more
> '11', two or more '111', ... opposite to the orignal perl-style
> non-greedy version, here the substrings should be tested for a match
> beginning with the longest (13 x '1') down to the shortest ('11').
>
> next i removed the empty line term from the regexp (i.e., the '?' from
> the '^1?$' term):
>
> $ echo "1111111111111" | grep -E '^(11+)\1+$|^1$' || echo prime
> prime
>
> now the result is correct. but since the input in not an empty line,
> using '^(11+)\1+$|^1?$' or '^(11+)\1+$|^1$' should not make any
> difference.
>
> (making the empty line term a separate term '^(11+)\1+$|^1$|^$' doesn't
> change anything. the same is true with using plain grep and
> '^\(11\+\)\1\+$\|^1\?$' or '^\(11\+\)\1\+$\|^1$\|^$'.)
>
> this bug also appears in the original upstream version 3.1
> (http://ftp.gnu.org/gnu/grep/grep-3.1.tar.xz)

Yikes! Thanks for forwarding that.
That is indeed a bug. I think it must be due to a bug in glibc's
regexp code, since that's the matcher that grep uses when there is any
back-reference.
Information forwarded to bug-grep@HIDDEN:
bug#29613; Package grep. Full text available.

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Subject: Re: bug#29613: Debian Bug#883733: grep returns 0 even if there is no
 match
To: "Santiago R.R." <santiagorr@HIDDEN>, 29613 <at> debbugs.gnu.org
References: <20171208111110.d4eigul6fpugqhwo@fedora-23-dvm>
From: Paul Eggert <eggert@HIDDEN>
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On 12/08/2017 03:11 AM, Santiago R.R. wrote:
> $ echo 1111111111111 | grep -E '^(11+)\1+$|^1?$' ; echo $?
> 1111111111111
> 0
>
> Shouldn't the last grep command exit 1 too?

Yes it should. This appears to be due to a longstanding bug in the glibc 
regular expression matcher. See:

https://sourceware.org/bugzilla/show_bug.cgi?id=11053
Information forwarded to bug-grep@HIDDEN:
bug#29613; Package grep. Full text available.

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Date: Fri, 8 Dec 2017 12:11:10 +0100
From: "Santiago R.R." <santiagorr@HIDDEN>
To: bug-grep@HIDDEN
Subject: Debian Bug#883733: grep returns 0 even if there is no match
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Dear grep developers,

I would like to forward the report below, filed by Mathias Pietsch to
Debian. I don't want to introduce other noise than this:

$ echo 1111111111111 | grep -E '^1?$' ; echo $?
1
$ echo 1111111111111 | grep -E '^(11+)\1+$' ; echo $?
1
$ echo 1111111111111 | grep -E '^(11+)\1+$|^1?$' ; echo $?
1111111111111
0

Shouldn't the last grep command exit 1 too?

Cheers,

 -- Santiago

----- Forwarded message from Mathias Pietsch <m.pietsch@HIDDEN=
e> -----

Date: Wed, 6 Dec 2017 23:51:52 +0100
From: Mathias Pietsch <m.pietsch@HIDDEN>
To: Debian Bug Tracking System <submit@HIDDEN>
Subject: Bug#883733: grep returns 0 even if there is no match
X-Mailer: reportbug 7.1.7

Package: grep
Version: 2.27-2
Severity: normal
Tags: upstream

when trying to test this famous regexp for matching non-prime numbers
(^1?$|^(11+?)\1+$) which works fine with 'grep -P', i wondered if it
also would work without the non-greedy quantifier so egrep or even
plain grep could use it, and found the following problem e.g., with the
prime number 13:

$ echo "1111111111111" | grep -E '^(11+)\1+$|^1?$' || echo prime
1111111111111

the expected output would have been 'prime' because '1111111111111'
doesn't match '^1?$' and is also no concatanation of two or more
'11', two or more '111', ... opposite to the orignal perl-style
non-greedy version, here the substrings should be tested for a match
beginning with the longest (13 x '1') down to the shortest ('11').

next i removed the empty line term from the regexp (i.e., the '?' from
the '^1?$' term):

$ echo "1111111111111" | grep -E '^(11+)\1+$|^1$' || echo prime
prime

now the result is correct. but since the input in not an empty line,
using '^(11+)\1+$|^1?$' or '^(11+)\1+$|^1$' should not make any
difference.

(making the empty line term a separate term '^(11+)\1+$|^1$|^$' doesn't
change anything. the same is true with using plain grep and
'^\(11\+\)\1\+$\|^1\?$' or '^\(11\+\)\1\+$\|^1$\|^$'.)

this bug also appears in the original upstream version 3.1
(http://ftp.gnu.org/gnu/grep/grep-3.1.tar.xz)


-- System Information:
Debian Release: 9.3
  APT prefers proposed-updates
  APT policy: (500, 'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=3DC, LC_CTYPE=3Dde_DE.UTF-8 (charmap=3DUTF-8), LANGUAGE=3DC =
(charmap=3DUTF-8)
Shell: /bin/sh linked to /bin/bash
Init: sysvinit (via /sbin/init)

Versions of packages grep depends on:
ii  dpkg          1.18.24
ii  install-info  6.3.0.dfsg.1-1+b2
ii  libc6         2.24-11+deb9u2
ii  libpcre3      2:8.39-3

grep recommends no packages.

Versions of packages grep suggests:
ii  libpcre3  2:8.39-3

-- no debconf information


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=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81

Universit=C3=A4tsklinikum Hamburg-Eppendorf; K=C3=B6rperschaft des =C3=B6=
ffentlichen Rechts;
Gerichtsstand: Hamburg | www.uke.de
Vorstandsmitglieder: Prof. Dr. Burkhard G=C3=B6ke (Vorsitzender), Prof. D=
r. Dr. Uwe
Koch-Gromus, Joachim Pr=C3=B6l=C3=9F, Martina Saurin (komm.)

=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81

SAVE PAPER - THINK BEFORE PRINTING



----- End forwarded message -----
Acknowledgement sent to "Santiago R.R." <santiagorr@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-grep@HIDDEN. Full text available.
Report forwarded to bug-grep@HIDDEN:
bug#29613; Package grep. Full text available.
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