The trouble with setting REGEX in analytics is that you never quite know it’s working until you start receiving data. This can take 24 hours after which you may need to change the REGEX again remembering settings each time. Another issue is that there are only so many goals you can set per each profile so too many trials and errors may may make you run out.
Analytics Content Advanced Search
One useful way to test REGEX is in analytics itself. If you paste the term in advanced search in content it should show the required data you want to isolate. If appropriate pages are shown then you can be sure the REGEX term will give required data.