create or replace function regexp_like(str character varying,reg character varying) 
returns boolean 
language plpgsql 
as $function$ 
declare v_match text;
begin
	
	select
		regexp_matches(str, reg)
	into
		v_match;
	
	if v_match is not null then 
		return true;
	else 
		return false;
	end if;

end;
$function$;

--true
select regexp_like ('123','12');
--false
select regexp_like ('13','24');