Select last_name from employees where
Last_name like '%a%' and
Last_name like '%e%' and
Last_name like '%s%' ;

regexp_like(last_name, '(.*a.*b.*c.*)|(.*a.*c.*b.*)|(.*b.*a.*c.*)|(.*b.*c.*a.*)|(.*c.*a.*b.*)|(.*c.*b.*a.*)')

^(?=.*a)(?=.*b)(?=.*c)

regexp_like(Last_name, 'a') and
regexp_like(Last_name, 'e') and
regexp_like(Last_name, 's')