[SR-Users] Find Values in User part of Diversion URI

Sorry if this is a super basic ask but I can't seem to work it out, I have got a work around but for my own sanity wanted to post the question on here. In Kamailio Native 5.5.2 I want to be able to look into this field $(di{uri.user}) and "find" or see if it "contains" a value i.e Diversion: "TEST" sip:112233445566@xxx.xxx.xxx.xxx;user=phone; find 234 or contains 234 I know how to do this in in KEMI Python but for the life of me cant get my head around it in Native. 2ndly is there an opposite to {s.numeric} Removes all non-numeric parts of string. I want the ability to strip all numeric parts. Keep us the good work. Lewis