Stricter check for adding zero-length match at end of string

matching.go

@@ -32,7 +32,7 @@ func findAllMatchesHelper(start *State, str string, indices []matchIndex, offset
 	// 'Base case' - exit if string is empty.
 	if len(str) == 0 {
 		// If the start is a Kleene star, then it should also match an empty string.
-		if start.isKleene {
+		if start.isKleene && start.isLast {
 			indices = append(indices, matchIndex{offset, offset})
 		}
 		return indices