How to run an add_action hook for specific page

Put is_page() inside the callback function:

function include_regForm_validation() {
    wp_register_script( 'jQuery_form_validation', 'https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.js',array('jquery'), '1.0', true );

    if ( is_page( 'login' ) ) {
        wp_enqueue_script( 'jQuery_form_validation');
    }
}
add_action( 'wp_enqueue_scripts', 'include_regForm_validation' );

WordPress has not determined what page/archive has been requested yet when hooks are added with add_action(), so you need to make the determination only when wp_enqueue_scripts actually runs, which you do by putting the check into your hooked function.