russian case-insensitive regexp search not working

Hello, friends.

OS FreeBSD 6.2, Postgresql 8.2.4

Postgresql does not search case-insensitive russian regexp unicode
patterns. Postgres is working under user pgsql with login class (in
/etc/login.conf):

postgres:\
:lang=ru_RU.UTF-8:\
:setenv=LC_COLLATE=C:\
:tc=default:

In .profile of postgres user:

LANG=ru_RU.UTF-8
export LANG
CHARSET=UTF-8
export CHARSET

Then, database:

db=> \encoding
UTF8

Case insensitive search for low-cased pattern show nothing:

db=> select street from people where street ~* 'зелен';
street
--------
(0 rows)

While there are records, but they are with first capital character:

db=> select street from people where street ~* 'Зелен';
street
----------------
Зеленая
Зеленоградская
(2 rows)

Search for english values work fine, russian values not. Why could it be?

--
alexander lunyov
lan(at)startatom(dot)ru