Just a nit: is that "search/:query/:page"?
example.com/#search/washington+news/p10
... to make it a bit more obvious that the number at the end is a page number. This is actually a real-world example -- it's the same route that DocumentCloud uses to run searches in the workspace. "image":"http://s3.dcloud.org/docs/101/pages/inauguration{page}-{size}.gif"
I'd be a bit concerned if we used them in Backbone, that we wouldn't be following the spec by parsing all variants of the expansions -- but on balance, it's probably a great thing to do.