iRule not catching www.domain.com

If you are unsure if the domain name is matching place a log statement below it:

 "*domain1.com" - "*domain2.com" {
        log local.0 "[HTTP::Host] has matched *domain1.com or *domain2.com"
        switch -glob [string tolower [HTTP::uri]] {

That will cause the actual value of [HTTP::Host] to be printed to the ltm logs if it matches your domain. You could also put a default into the switch that might offer more detail as to why your host is not matching the wildcard.