Added test

re_test.go

@@ -24,6 +24,7 @@ var reTests = []struct {
 	{"(abc)*|(def)*", "abcdef", []matchIndex{{0, 3}, {3, 3}, {3, 6}, {6, 6}}},
 	{"b*a*a", "bba", []matchIndex{{0, 3}}},
 	{"(ab)+", "abcabddd", []matchIndex{{0, 2}, {3, 5}}},
+	{"a(b(c|d)*)*", "abccbd", []matchIndex{{0, 6}}},
 }
 
 func TestFindAllMatches(t *testing.T) {