redirect irule

The syntax you have there should work without modification; A10's language is, how can I put it, eerily similar to iRules.

I would strongly advise you (and anyone else using HTTP::uri) to use [HTTP::uri -normalized], though, to avoid an attacker being able to evade your iRule logic by encoding, escaping or inserting path traversal characters: https://clouddocs.f5.com/api/irules/HTTP__uri.html