Help with route regex if specific words are present

[eluser]CroNiX[/eluser]
I have a few custom pages like
site.com/about
site.com/help
site.com/privacy

Currently they are going to their own controllers. I want to create a generic controller that will handle these specific pages but leave the rest of the routing alone.

I think this is close but can't quite get it. I'm a regex idiot...and I admit it.

Code:

$route['((?about|help|home|privacy|tou).*)'] = 'custom_page/$1';

Thanks for any help.