redirect if hosts are on the external segment

I want to do:

• if a user is on the trusted network segment, the user can access www.company.com and any URI after that
• if a user is on the untrusted network segment, the user can access www.company.com
• if a user is on the untrusted network segment and the user is trying to access to www.company.com/user then he will be redirected to www.company.com
• if a user is on the untrusted network segment and the user is trying to access to www.company.com/xyz/user, the user will be redirected to www.company.com/xyz

After reading Nitass's answer and looking up more on devcentral, I have the iRule code to achieve those and it seems to work:

when HTTP_REQUEST {
 if the request is from the trusted network segments
if {[IP::addr [IP::client_addr] equals 10.10.10.3/32] or [IP::addr [IP::client_addr] equals 10.55.88.0/24]} {
    log local0. "First IF"
            pool seattle-only
    return
}
 if the request is from untrusted network segment
switch -glob [string tolower [HTTP::path]] {
    "/user" { 
        log local0. "1st SWITCH PATH:[HTTP::path] URI:[HTTP::uri]"
        HTTP::redirect "http://[HTTP::host]" 
        }
    "/*/user" {
        set new_uri [getfield [HTTP::uri] "/" 2]
        log local0. "WILD CARD SWITCH PATH:[HTTP::path] URI:[HTTP::uri] NEW_URI: $new_uri"
        HTTP::redirect "http://[HTTP::host]/$new_uri"
        }
    default {
        log local0. "DEFAULT: PATH:[HTTP::path] URI:[HTTP::uri]"
        pool seattle-only
    }
}

}

Thanks,