# Search the last occurence of the text `t`.
	#
	#     assert "bob".search_last("b").from == 2
	#     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
	fun search_last(t: Text): nullable Match do
		return search_last_up_to(t, length)
	end