Proc returns a Proc, but match is expecting a string. You could try adding . Call to have the proc return its value.
Though I'm not sure if this will end up calling the proc each time or only when routes is loaded...
Putting this in your routes seems really hacky. I would recommend creating a Slugs controller, passing this task onto that, and redirecting to the appropriate controller from there. Assuming your other pages use standard RESTful routes, you could do something like this.
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