I currently have this in my CodeIgniter routes file.
It maps anything with a URI api/controller/function
to controller/api_function
.
Try this:
$route['api/([^/]*)/([^/]*)/(.*)'] = '$1/api_$2/$3';
It basically checks for two segments (any character but a slash), then anything after that gets appended as parameters to your controller function.
This wouldn't match for routes with NO parameters, but it's not hard to do if that's a case you need to handle.