F5 irule intercept and configured JSON response question

I think there's some code missing from your post as you talk about intercepting a response but there is no HTTP_REPONSE in the code posted - can you please repost and also please format a bit better (use tabs at beginning of code lines and also a blank line at top and bottom of code). It looks like the code you have posted above would work, however I don't understand where JSESSIONID comes into it....