Load Balancing based off TCP Payload entity

I thought about this some more and I think this logic would work. After collecting unecrypted payload if it contained a string then use the findstr parameters in case1 and LB/persist. If the payload contained another string then use the findstr parameters for case 2 and LB/persist the same... Here is a rough draft but I have syntax errors that need sorting....

when CLIENTSSL_HANDSHAKE {
   log local0. "[IP::client_addr]:[TCP::client_port]: SSL handshake completed, collecting SSL payload"
   SSL::collect
}
when CLIENTSSL_DATA {
   set payload [SSL::payload]
   if { [SSL::payload] contains "UserID" } {
   set entityID [findstr $payload "@" 1 ","]
   log local0. "Here is the zzz TCP socket and the entity is $entityID: $entityID"
   pool xxxx_Pool
   persist uie $entityID 1800 "JEFF" } {
   set entityID2 [findstr $payload "@" 1 "."]
   log local0. "Here is the JEFF TCP socket and the entity is $entityID2: $entityID2"
   pool xxxx_Pool
   persist uie $entityID2 1800
   SSL::release
   }
}