changing the route

I have added the following route:
$route['save_userinput']='Users/save_userinput';

My idea was that in a form when I have 
<form name ="userinput" action="save_userinput" method="post">

would actually run the method save_userinput() in the Users class. 





But this does not seems to work. Is it possible to use route to change the "action" of a form? I found an example online which shows <form action="/action_page.php" method="get"> as sending the form to action_page.php. But CI doesn't work like this. So is it possible to send a form to a method in a class? 

proof that an old dog can learn new tricks