Getting the Nth instance of an element

Getting the Nth instance of an element

I have a column filled with data that has a path. I'd like to get the last
element in the path, the second last element, and the first element. For
example, for the following data:
\Product\Release\Iteration
\Product\Folder1\Folder2\Anotherfolder\Release2\Iteration5
\Product
\Product\Somefolder\Release3\Iteration5
I'd like to get the following in cells
In cell B1: "Product", cell C1: "Release", cell D1: "Iteration"
In cell B2: "Product", cell C2: "Release2", cell D2: "Iteration5"
In cell B3: "Product", cell C3: blank, cell D3: blank
In cell B4: "Product", cell C4: "Release3", cell D4: "Iteration5"
Getting the first and the last component is easy. I'm mostly just
struggling with getting the second to last component (column C in the
example above).