Can't get routes to work how I want it to

[eluser]ElliotReevey[/eluser]
I started work on my first every project using Codeigniter and hoping you guys can help me out.

I have a controller called campaign which has an index() and newcampaign() function which all works fine using the following urls http://website.com/campaign and http://website.com/campaign/newcampaign.

However I am looking to extend this so that anything after http://website.com/campaign which is NOT equal to newcampaign routes to the viewcampaign() function for example http://website.com/campaign/campaign1.

I have so far been working on the routes.php file in the config folder and have tried:

Code:

$route['campaign/^((?!newcampaign)\S*)'] = "campaign/$1";

However when I go to say http://website.com/campaign/campaign1 I get a 404 not found.

Can anyone shed any light on how to achieve what im looking for?

Cheers