Datagroup audit through VIP

Long and short is that we have an external address datagroup that we interrogate from a VIP for auditing.

Datagroup:

        host x.x.x.x := "blah",
        network y.y.y.0/20 := "blah blah,",
        host z.z.z.z := "blah blah blah",

Rule:

        when HTTP_REQUEST {
            switch [string tolower [HTTP::uri]] {
                "/auditurl" {
                    HTTP::respond 200 content "[string map { " " "\n" } [class names penaltybox-dg]]" Cache-Control "no-cache,no-store" Content-Type "text/plain"
                }
            

This does a good job of dumping out all of the records in the datagroup, but is not an easy thing to filter OUT the host entries. It's a pretty easy to apply a filter to "class name" to include something, but have had a hard time figuring out a way to EXCLUDE something.

        x.x.x.x/32
        y.y.y.0/20
        z.z.z.z/32

Is there a way to filter out all of the host entries, so no more "/32"s in the listing? Any help would be appreciated. Thanks all.

Cameron