Yup.. use InStrRev()
InStrRev(SearchString, SearchFor [, Start[, Compare]])
SearchString = The string you wish to search in (required)
SearchFor = The string you are searching for in SearchString (required)
Start = Position in SearchString to start searching from (optional)
Compare = Comparision constant. 0 = Binary Compare, 1 = Textual Compare, 2 = Database Compare (optional)