bug#26005: bug in grep

[Ildar Rakhmanov]

Hi, I tested this with latest grep 3.0 in linux RHEL and some Ubuntu
servers as well.

To reproduce run in empty directory

echo "start_string_20091210.end" | grep -o
[1-2][0][0-1][0-9][0-1][0-9][0-3][0-9]
mkdir 20011209
echo "start_string_20091210.end" | grep -o
[1-2][0][0-1][0-9][0-1][0-9][0-3][0-9]
rmdir 20011209
echo "start_string_20091210.end" | grep -o
[1-2][0][0-1][0-9][0-1][0-9][0-3][0-9]


the results is

20091210
20091210

grep return is empty when directory, 20011209, is present and is as
expected when directory removed.

Thanks for reading,
Ildar