Cake\Localized\Validation\AuValidation::postal PHP 메소드

    public static function postal($check)
    {
        $pattern = '/^[0-9]{4}$/';
        return (bool) preg_match($pattern, $check);
    }

 /**
  * test the postal method of AuValidation
  *
  * @return void
  */
 public function testPostal()
 {
     $this->assertTrue(AuValidation::postal('2300'));
     $this->assertFalse(AuValidation::postal('02300'));
 }