Cake\Localized\Validation\IrValidation::postal PHP Method

    public static function postal($check)
    {
        $pattern = '/^\\d{10}$/';
        return (bool) preg_match($pattern, $check);
    }

 /**
  * test the postal method of IrValidation
  *
  * @return void
  */
 public function testPostal()
 {
     $this->assertTrue(IrValidation::postal('1234567890'));
     $this->assertFalse(IrValidation::postal('teststring'));
     $this->assertFalse(IrValidation::postal('123456789'));
 }