preg_match() aaaaa: passed ŁŁŁŁŁ: didn't pass : passed : passed ŘĹ: passed preg_match() with (*UTF8) aaaaa: passed ŁŁŁŁŁ: passed : didn't pass : didn't pass ŘĹ: didn't pass mb_ereg() aaaaa: passed ŁŁŁŁŁ: passed : didn't pass : didn't pass ŘĹ: didn't pass