Peristence based on parameter contains/appears in URI

Hello All, I am working on one assignment and trying to use persistence based on URL. The BIGIP system is running on TMOS version 11.6 with HF3. And I am trying to implement persistence using a string that appear/contains in URL. URL is https://jaylab.in/1311$newserver=serverddaadsdad, at 1st stage select the load balance pool/pool member and the stickiness with the same member. But it didn't work.

Please let me know if some already did the same task and help me with iRule on above.

Thanks...