As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
192.168.10.33:8091/alfresco/api/-default-/public/alfresco/versions/1/people/p1372/sites?where = (title%20MATCHES%20'BNET*')
Looking at the source code, queries for sites only support querying for visibility and site preset. That is also what the documentation says, so your request is simply specifying conditions that are not supported.