CREATE TABLE t (
id int primary key auto_increment,
v varchar(65)
);
insert into t(v) values
('xxxxxx'),
('300ั 250ั 625'), -- ััััะบะฐั ะฑัะบะฒะฐ ั
('300x250x625'); -- english x
select * from t where v REGEXP 'ั ';
select * from t where v REGEXP '300[ั x]250[ั x]625';