How to get oauth code from Codeigniter's SEO friendly urls

[eluser]Blue Sapphire[/eluser]
Iam receiving folowing url from aouth site:

http://localhost.com/demo/user/login/?oa...j4j5j6j7j8

When this url is redirected to my website, it takes to default 'welcome' controller.
"http://localhost.com/demo/" is my base url.

Can some one guide me, how can I get proper redirection from above mentioned url.

I think, '?' character is not read by routes. I have used following route types (one by one):

1- $route['user/login/:any'] = "user/oauthsuccess";
2- $route['user/login/?:any'] = "user/oauthsuccess";

Can some one guide me how can I solve this problem.

Thanks in advance