Added more test cases

re_test.go

@@ -22,6 +22,7 @@ var reTests = []struct {
 	{"(abc)*", "abcabcabc", []matchIndex{{0, 9}}},
 	{"((abc)|(def))*", "abcdef", []matchIndex{{0, 6}}},
 	{"(abc)*|(def)*", "abcdef", []matchIndex{{0, 3}, {3, 6}}},
+	{"b*a*a", "bba", []matchIndex{{0, 3}}},
 }
 
 func TestFindAllMatches(t *testing.T) {