Yes, it is. Just toggle Match Whole Word case on for Source search on the check ;).
Kind regards,
P. S.: BTW, if Case Sensitive case is off, it is meaningless to include both “FEB” and “Feb” on your search. Probably, just toggling Case Sensitive on would be enough for your purposes, but if you want to avoid the potential false positives from “Febrile”, “Febricula” or the like, toggle Match Whole Word on as well.
As Manuel states, this is reported because the Match Whole Word checkbox is not enabled for the source term. Indeed, you should enable Case-sensitive since it will find examples such as fEB or fEb.