Cake\Localized\Validation\BeValidation::postal PHP Метод

    public static function postal($check)
    {
        $pattern = '/^[1-9]{1}[0-9]{3}$/';
        return (bool) preg_match($pattern, $check);
    }

 /**
  * test the postal method of BeValidation
  *
  * @return void
  */
 public function testPostal()
 {
     $this->assertTrue(BeValidation::postal('1804'));
     $this->assertFalse(BeValidation::postal('01804'));
 }