Host re-direct except for directory?

when HTTP_REQUEST {
     Check if domain is "www.domain.com"
    if {[string tolower [HTTP::host]] eq "www.oil.com"}{
         Check if URI isn't /specialdirectory
        switch -glob [string tolower [HTTP::uri]] {
           "/ger" -
           "/ger/" -
           "/ger/*" {
                 Exit this event from this iRule
                return
           }
           default {
                 Redirect everything else to the following
                HTTP::redirect "http://www.test.com/abc"
           }
        }
    }
}