Red Hat Bugzilla – Bug 249153
'\s' should match 's'
Last modified: 2009-01-08 23:48:47 EST
With LANG=C, one gets:
$ echo -e 'x y\nxsy'|grep 'x\(\s\)y'
which shows that \s matches s. But if we use a multibyte locale, or even a
complicated regexp, we get:
$ echo -e 'x y\nxsy'|grep 'x\(\s\|a\)y'
This inconsistency was analyzed by Flávio Leitner in bug #244768.
The behaviour of these regular expressions is undefined according to the GNU
grep documentation, and \s in undefined in POSIX BRE's and ERE's.
I believe the traditional behaviour was to match 's', thus it might be desirable
to maintain it, at least for C locale.
I forgot to mention the most important result of Flávio's analysis:
this is a symptom of an inconsistency between dfa.c and GNU regex (in libc):
dfa.c interprets '\s' as 's', while the GNU regex (is configured to?) interpret
it as a "space" character.
Based on the date this bug was created, it appears to have been reported
during the development of Fedora 8. In order to refocus our efforts as
a project we are changing the version of this bug to '8'.
If this bug still exists in rawhide, please change the version back to
(If you're unable to change the bug's version, add a comment to the bug
and someone will change it for you.)
Thanks for your help and we apologize for the interruption.
The process we're following is outlined here:
We will be following the process here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping to ensure this
doesn't happen again.
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