使用htaccess更新网址

I want to change the formatting of this URL:

~/index.php/user/category_grid/?id=4&name=%27Door%20Knobs%27

to

~/index.php/user/category_grid/4/Door Knob

How can I accomplish this?

Here is an example of Rewrite rule that would transform the URL

RewriteRule index.php/user/category_grid/([-\w]+)/([-\w]+)/?$   index.php/user/category_grid?id=$1&name=$2 [L]