irule development - fixed variables within iRule context

So here's the way that we use a shared iRule for whole subset of VIPs. This uses the Virtual name that the client connected to in order to identify a specific Data group with a matching (almost matching, a few mods) name.

set vsname [string trimright [join [lreplace [split [getfield [split [virtual name]] / [llength [split [virtual name] /] ] ] -] end end ""] -] -]
set dgnameTmp "[string trimright [string range [virtual name] 0 [string last - [virtual name]]] "-"]"
set dgname [append dgnameTmp "-DG"]
if {$static::log_debug}{
    log local0. "Data Group Tmp Name is: $dgnameTmp"  
    log local0. "Data Group Name is: $dgname"  
}

Long and short, if you Virtual was named "this-is-a-foo-house-80" your datagroup name would be "this-is-a-foo-house-DG". That way you can set any variables you want for that specific instance right there.