Controller_Validator_Advanced::resolveRuleAlias PHP Method

    public function resolveRuleAlias($rule)
    {
        //  4..20
        if (strpos($rule, '..') !== false) {
            list($min, $max) = explode('..', $rule);
            $this->pushRule($min, $max);
            return 'between';
        }
        return parent::resolveRuleAlias($rule);
    }