Redirect direct registration page access by .htaccess

Question

I would like to redirect registration page to homepage by using .htaccess now my code is redirecting to /component/users/?view=login&Itemid=437 which is login page. I would like to make registration and front-end login page not accessible for users.

So the target is to redirect /component/users/?view=login&Itemid=437 and /index.php?option=com_users&view=registration&Itemid=999 to "403 error page"

# RewriteBase /

# Disable calls to user registration ("register", this url ends with: view=registration))
# Send all blocked request to homepage, use Flag [F] for 403 Forbidden error!
RewriteCond %{QUERY_STRING} (view=registration) [NC]
RewriteRule .* index.php [F]

## Begin - Joomla! core SEF Section.
#
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
#
# If the requested path and file is not /index.php and the request
# has not already been internally rewritten to the index.php script
RewriteCond %{REQUEST_URI} !^/index\.php
# and the requested path and file doesn't directly match a physical file
RewriteCond %{REQUEST_FILENAME} !-f
# and the requested path and file doesn't directly match a physical folder
RewriteCond %{REQUEST_FILENAME} !-d
# internally rewrite the request to the index.php script
RewriteRule .* index.php [L]
#
## End - Joomla! core SEF Section.

Answer 1

If you really want to close out visitors from users pages, then maybe you can also create a system plugin and onAfterroute event you could use something like the following code:

public function onAfterRoute()
{
    if ($this->app->getRouter()->getVar('option') === 'com_users')
    {
        $guestRedirectUrl = '/index.php';
        $this->app->redirect($guestRedirectUrl, $status = 303);
    }
}

(if you use it on a live webserver, the leading slash is not needed in the redirect url).

Or another version, as @Sharky has suggested, the following is more effective on sef urls:

if ($this->app->input->get('view') === 'registration')
{
    // let's redirect...
}

This is just a sudden idea on this, instead of using .htaccess for redirect. From the router you can get Itemid or view too, so it can work on more precise condition too like:

if ($this->app->getRouter()->getVar('view') === 'registration') and on many other versions of conditions. if sef urls are used this will not work on those pages, however this will:

$pagevars = $this->app->getRouter()->getVars();
if ($pagevars['option'] === 'com_users' && $pagevars['Itemid'] === '437')
{
    // do redirect...
}

(Itemid should be changed to your registration page's Itemid of course).

(Itemid and option (component name) is available via router too even if someone uses sef urls).

Sidenote: creating a plugin for these kind of small tasks sounds quite stupid, but it is not if you can/would later use this same custom system plugin of yours to do few other things on your site via a system plugin. It comes handy at those times too.