Validation match_field comparasion password

login.php

<?php public function registerStepOne($params) {

        $userCollection = \Mongaconnector::collection($this->collection);

        $registerValidation = \Validation::forge('registerStepOne');
        $registerValidation->add_callable(new \validationRegister());
        $registerValidation->add_field('username', 'Your username', 'required');
        $registerValidation->add_field('password', 'Your password', 'required|min_length[3]|max_length[10]');
        $registerValidation->add_field('confirm_password', 'Confirm Yor Password', 'match_field[password]');





    }