load balancing based on payload string

hello ,

we have an application that is userd by severals clients ,each client has an id that is inserted on request payload .

the vip is on ssl and the backen is on ssl also ,

we want to send the trafic of specific client to an another pool .

how can do that with an irule ,the irule must search for the client id on payload and forward the trafic to the good pool .