Control: forwarded -1 https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36148 Control: tags -1 + upstream
Thanks for your bug report, -- Santiago El 09/06/19 a las 11:22, g1 escribió: > Package: grep > Version: 2.27-2 > Severity: normal > > There seems to be a problem with beginning/end-of-line anchors in regex > containing back-references: > > $ cat words > ana > deed > ill > stats > > Using -x to match whole line works: > > $ egrep -x '(.?)(.?).?\2\1' words > ana > deed > stats > > Using explicit anchors emits false positives: > > $ egrep '^(.?)(.?).?\2\1$' words > ana > deed > ill <<< > stats > > On the other hand, colouring the output shows that grep somewhat knows its > mistake: > > $ egrep --color '^(.?)(.?).?\2\1$' words > ana (coloured) > deed (coloured) > ill > stats (coloured) > > -- System Information: > Debian Release: 9.9 > APT prefers stable-updates > APT policy: (500, 'stable-updates'), (500, 'stable') > Architecture: amd64 (x86_64) > > Kernel: Linux 4.9.0-9-amd64 (SMP w/4 CPU cores) > Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C > (charmap=ANSI_X3.4-1968) > Shell: /bin/sh linked to /bin/dash > Init: sysvinit (via /sbin/init) > > Versions of packages grep depends on: > ii dpkg 1.18.25 > ii install-info 6.3.0.dfsg.1-1+b2 > ii libc6 2.24-11+deb9u4 > 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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