|Summary:||inconsistent \w and [[:alnum:]] behaviour|
|Product:||Red Hat Enterprise Linux 6||Reporter:||Lukas Zachar <lzachar>|
|Component:||grep||Assignee:||Jaroslav Škarvada <jskarvad>|
|Status:||CLOSED ERRATA||QA Contact:||Jan Kepler <jkejda>|
|Fixed In Version:||grep-2.20-1.el6||Doc Type:||Bug Fix|
Cause: Previously the behavior of \w and \W symbols in regular expressions were inconsistent with the behavior of [:alnum:] character class. Consequence: Some expressions could cause incorrect match/non-match. Fix: Upstream fix was backported that makes the behavior consistent. Result: Now \w is synonym for [_[:alnum:]] and \W for [^_[:alnum:]].
|:||1159012 1187243 (view as bug list)||Environment:|
|Last Closed:||2015-07-22 06:17:47 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Cloudforms Team:||---||Target Upstream Version:|
|Bug Depends On:|
|Bug Blocks:||1159012, 1187243|
Description Lukas Zachar 2012-03-05 10:02:23 UTC
Description of problem: \w and [[:alnum:]] seems to match different set of characters: $ echo 'á' | grep '\w' $ echo 'á' | grep '[[:alnum:]]' $ á Their negations are inconsistent as well: $ echo 'á' | grep '[^[:alnum:]]' $ echo 'á' | grep '\W' $ á This doesn't seem to be problem of a locale (I tried it with the en_US.UTF-8 and cs_CZ.UTF-8, both made the same results). Affected are accented characters Á Č Ď É Ě Í Ň Ó Ř Š Ť Ú Ů Ý Ž (I have tested just these) Version-Release number of selected component (if applicable): grep-2.6.3-2 How reproducible: always Steps to Reproduce: 1. echo 'á' | grep '\w' 2. 3. Actual results: -empty- Expected results: á Additional info:
Comment 2 Jaroslav Škarvada 2012-03-20 15:37:46 UTC
Upstream ticket: http://savannah.gnu.org/bugs/?19637 Also reproducible with latest grep-2.11.
Comment 3 RHEL Product and Program Management 2012-09-07 05:04:46 UTC
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate, in the next release of Red Hat Enterprise Linux.
Comment 4 Jaroslav Škarvada 2014-10-30 16:57:42 UTC
Created attachment 952258 [details] Backported fix
Comment 6 Jaroslav Škarvada 2014-10-30 17:00:29 UTC
This can be also resolved by rebase to grep > 2.20.
Comment 7 Jaroslav Škarvada 2015-01-29 14:36:03 UTC
Created attachment 985631 [details] grep-2.20 fix (In reply to Jaroslav Škarvada from comment #6) > This can be also resolved by rebase to grep > 2.20. This is now preferred way, patch for grep-2.20 is attached.
Comment 8 Jaroslav Škarvada 2015-01-29 15:37:21 UTC
RHEL-7 is also affected by this, thus cloning to RHEL-7, not to have regression there.
Comment 12 errata-xmlrpc 2015-07-22 06:17:47 UTC
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2015-1447.html