Does REST query allow for a contains condition
I see two ways to do it. The first one is to use the "=" operator instead of "==". It will match the whole word using stemming like in a full text search.
Also, if your field is marked as facet, you could use the wildcard operator "*=". It can be handy if you are trying to match a specific part of a word. The query would look like this:
@fname60016 *= "*xxxx*"
Is it what you are looking for?