Level 17

Now let's play: regEx
Find out what password will make the preg_match function return 1

function pwCheck($password)
{
    return preg_match('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,})$/i', $password, $found);
}