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Description of problem:

grep  '^[A-Z]*$' doesn't work as expected with multibyte locale

Version-Release number of selected component (if applicable):

grep-2.6.3-6.el6


How reproducible:

Always

Steps to Reproduce:
1. echo -e "B\na\nb\n\nc"|grep  "^[A-Z]*$"


Actual results:

$ echo -e "B\na\nb\n\nc"|grep  "^[A-Z]*$"
B
b

c
$

Expected results:

$echo -e "B\na\nb\n\nc"|grep  "^[A-Z]*$"
B

$

Additional info:

Backport of upstream commit 

http://git.savannah.gnu.org/cgit/grep.git/commit/?id=7311894799583626ec1208039abd13d430c8a452

attached.

Not a bug.

grep-2.21:
echo -e "B\na\nb\n\nc"|grep  "^[A-Z]*$"
B
a
b

c

This is due to collating of some multi-byte locales, e.g. AaBbCc..., so 'a' matches the [A-B] range. Please use C locale or character classes, e.g.:
$ echo -e "B\na\nb\n\nc"|grep  "^[[:upper:]]*$"
B

For details see grep manual page, section "Character Classes and Bracket Expressions".

It's bug:

$ LANG=en_US.UTF-8

$ echo -e 'A\nb' | grep '^[A-Z]*$'
A
b

$ echo -e 'A\nb' | grep '^[A-Z]$'
A

but:

$ LANG=cs_CZ.UTF-8

$ echo -e 'A\nb' | grep '^[A-Z]*$'
A
b

$ echo -e 'A\nb' | grep '^[A-Z]$'
A
b

For given locale the behavior must be consistent for both commands. Addressed by rebase request in bug 1064668.

Patch is OK, but unnecessary due to approved rebase request (bug 1064668).

It is not reproducible in grep-2.20.

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