How do you pass all client side routes through?

[DaveSanders]

Instead of having to list out every external route, is there a way to pass everything through to the client?

(Yes, I realize this isn't the normal way of doing things because you'd want some routes to hit the Express server, but in my scenario I'm pulling those requests out via the browser client string, so if the user isn't a bot (such as FB or Twitter) then I want to route to the normal client route.)

The readme says I can supply a regular expression - is there an example of this?