X-Forwarder to redirect external access to webpage to https

I'm definitely new to irules and codes so bare with me. I'm trying to come up with an irule in the LTM that will allow me to have internal clients to a webpage clear text(http), while redircting external clients to https. Here's the irule I having problems with. I keep getting an error with the "ne" when reffering to my data group list for the inside rfc1918. Any help would be appreciated!

when HTTP_REQUEST { log local0. "X-Forwarded-For: [HTTP::header "X-Forwarded-For"]"

            foreach xff [split [string map [list " " ""] [HTTP::header "X-Forwarded-For"]] ","] {
                log local0. "Current XFF element: $xff"

             if {[class match $xff ne private_net]}{
                HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
                }
             }

}