iRule expressions for not-eqauls in datagroup

Thanks for the response! With the irule that you provided -- it looks to me that if the uri and datgroup list are present that it will allow the traffic to go to the pool. Then if the ip address is NOT present, then it will redirect all traffic to the external page. The issue I forsee happening is that it will break all other traffic to this pool. There are many other URI's that should work, but I believe would now get redirected based on this. Example..

Currently this application has two logon pages one for java and one for non java. The URI's have different paths (Java = /uri/java/logon vs Non-Java /uri/app/logon), so this was easy for me to create an iRule only allow a match on that java uri and data group list, then if not, then send to nonjava. We discovered later on that we had users that had bookmarks within this application that can get around the actual logon page. So when you logon to the actually application, the uri changes to uri/random/landingpage.do for the java page and then uri/random/landingpage.do?ESS=true. Since the java and non java are so close in name, I have to figure a way to say if you are coming from this datagroup IP list and equals uri/random/landingpage.do to allow the traffic to happen, but if you are coming from an IP address outside of the datagroup list and equals uri/random/landingpage.do, then send to the external page.