change register url on wp-login page

I am just trying to change the url of “register” on wp default login page(domain.com/wp-login.php)

1. I want to change the url on register link.

2. when you are on domain.com/wp-login.php?action=register, I want to redirect to domain.com/register

I have added redirect link. but it’s not working.

 RedirectMatch 301 /wp-login.php?action=register$ http://domain.com/register/$1

Am I missing something?

I just want to use my register page (domain.com/register/)

Code from @bainternet’s website.

function wpse127636_register_url($link){
    /*
        Change wp registration url
    */
    return str_replace(site_url('wp-login.php?action=register', 'login'),site_url('register', 'login'),$link);
}
add_filter('register','wpse127636_register_url');

function wpse127636_fix_register_urls($url, $path, $orig_scheme){
    /*
        Site URL hack to overwrite register url     
        http://en.bainternet.info/2012/wordpress-easy-login-url-with-no-htaccess
    */
    if ($orig_scheme !== 'login')
        return $url;

    if ($path == 'wp-login.php?action=register')
        return site_url('register', 'login');

    return $url;
}
add_filter('site_url', 'wpse127636_fix_register_urls', 10, 3);