Cake\Localized\Validation\RuValidation::phone PHP Method

    public static function phone($check)
    {
        $pattern = '/^\\+7 \\(\\d+\\) \\d{3,}$/';
        return (bool) preg_match($pattern, $check);
    }

 /**
  * test phone method of RuValidation
  *
  * @return void
  */
 public function testPhone()
 {
     $this->assertTrue(RuValidation::phone('+7 (342) 1234567'));
     $this->assertTrue(RuValidation::phone('+7 (41144) 1234'));
 }