Regular Expression Routes in Rails

I am looking to create a rails route that is capable of accepting requests using a regular expression. Specifically, I need optional paths. As an example:

"(/first)?开发者_如何学Go(/second)?"

Would match:

/first

/second

/first/second

But not:

/second/first

Is this possible? Thanks.

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Updated to Rails 3 (now correctly supports REGEX routes).