Check op nummers in WooCommerce adresveld

// Check if address field contains house number otherwise provide error message
  add_action( 'woocommerce_after_checkout_validation', 'validate_checkout', 10, 2);
  function validate_checkout( $data, $errors ){
      if (  ! preg_match('/[0-9]/', $data[ 'billing_address_1' ] ) ){
          $errors->add( 'address', 'Het adresveld bevat geen huisnummer of busnummer.' );
      }
  }