Hi Jim,

It seems the problem is still unsolved. I've tried both, 2.8 and patching 2.7, but I got the same results. Igor Ladygin confirms this.

santiago@nomada:~$ echo Пример| LC_ALL=ru_RU.KOI8-R grep -qE "[Пп]"; echo $?
1
santiago@nomada:~$ echo Sример| LC_ALL=ru_RU.KOI8-R grep -qE "[Ss]"; echo $?
0

Santiago

Thanks for the report.
however, I cannot reproduce the problem with grep-2.7 built from upstream sources.  Nor can I reproduce it using the grep-2.7 that comes from Fedora 15.

To test it, I put these two lines in a file,

#!/bin/sh
echo Пример| LC_ALL=ru_RU.KOI8-R grep -qE "[Пп]ример"; echo $?

and then ran "bash FILE".  It always prints 1.
(Of course, I set PATH to select either /bin/grep or ./grep,
depending on which I'm testing).

On that basis, I've closed this ticket.
If you have evidence that there's a real problem with the upstream sources, feel free to reopen it.