bug#15773: grep-2.15 bug report

[Mirraz Mirraz]

After updating from 2.14 to 2.15 grep has started to fail to match patterns 
that contain '\s*' or '\s\+'
For example:

(grep-2.14)
$ echo '[ ]' | grep '\s*'
[ ]
$

(grep-2.15)
$ echo '[ ]' | grep '\s*'
$