iRule with JSESSIONID including the server id with jvmRoute

plan C:

Creating the universal persistence profile

To create a universal persistence profile and reference the persistence iRule you created in the previous procedure, perform the following procedure:

1. Log in to the Configuration utility.
2. Navigate to Local Traffic > Profiles.
3. From the Persistence menu, click Create.
4. Type a name for the universal persistence profile.
5. For Persistence, click Universal.
6. For Configuration, select the iRule check box, then click the persistence iRule you created.
7. Click Finished.

iRules code:

when HTTP_RESPONSE priority 500 {
    if { [HTTP::cookie exists "JSESSIONID"] } {
        # serverID0,serverID1, length is 9
        set node_x [findstr [HTTP::cookie "JSESSIONID"] "serverID" 0 9]
        log local0. "node_x is $node_x"
        # persist add uie, key is serverIDX, timeout is 1800s
        persist add uie $node_x 1800
    }
}
when HTTP_REQUEST priority 500 {
    if { [HTTP::cookie exists "JSESSIONID"] } {
        set server_x [findstr [HTTP::cookie "JSESSIONID"] "serverID" 0 9]
        set value [persist lookup uie $server_x]
        if { $value != "" } {
            persist uie $server_x
        }
    }
}