Problem with admin routes

[eluser]nuts[/eluser]
Hello,

I started with CodeIgniter few days ago, and I've found this framework very interesting.

But I encounter a problem with my routes, I want to make /controller/admin_action accessible by /admin/controller/action

I tried

Code:

$route['/(.+?)(/admin_)(.+?)/'] = "admin/$1/$2";

But It's not working, can someone help me ? :-)

Thanks,

Ps: Sorry if I have not a good english :red: