+ # assert "bob".search_last("bo").from == 0
+ # assert "bob".search_last("ob").from == 1
+ # assert "bobob".search_last("ob").from == 3
+ # assert "bobbob".search_last("bb").from == 2
+ # assert "bobbob".search_last("bob").from == 3
+ # assert "bob".search_last("z") == null
+ # assert "".search_last("b") == null