Thanks, I finally get it - this works fine: # select 'axxxxxyz' ~ E'(.)\\1\\1'; ?column? ---------- t (1 row) # select 'ОШИБББКА' ~ E'(.)\\1\\1'; ?column? ---------- t (1 row) -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general