Chris, I tried to do this yesterday and faced an issue:
Say I had http://place/operation, http://place/operation2, etc. Then, I also had http://servername. What I wanted to do was regex "http://.*?/(.*?)" but then also OR that for the servernames. If I just keep the above regex, All Other Operations and things not matching the pattern are blank or say null. I tried to follow a regex syntax for ORs and it didn't seem to work (?(?=regex)then|else). Do you know, does DC RUM support any OR regexes for a case like this?