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

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

 /**
  * test the postal method of ChValidation
  *
  * @return void
  */
 public function testPostal()
 {
     $this->assertTrue(ChValidation::postal('5112'));
     $this->assertFalse(ChValidation::postal('05112'));
 }