How check string if he contains at least 1 number or 1 letter?

How can I ensure a string contains at least 1 number 开发者_运维技巧or 1 letter?

Thanks.

---

$valid = preg_match('/[\pL\pN]/U', $str);

$strs = array(
   'привет', // TRUE
   'hello',  // TRUE
   '42',     // TRUE
   '%'       // FALSE
);

Check it.

---

$contains = preg_match('~[\da-z]~i', $str)