How to find the second last indexof a value in a string?

Question

string referrer = "?404;http://stage.hello.com:80/Applications/";

referrer = referrer.Substring(referrer.LastIndexOf("/") + 1);

By doing this I get referrer value "" as answer.

I want my referrer value to be "Applications/"

How can I achieve this?

Any help will be greatly appreciated.

Answer 1

referrer = referrer.Substring(referrer.Substring(0, referrer.LastIndexOf("/")).LastIndexOf("/") + 1);

Answer 2

First variant:

referrer = Regex.Match(referrer, @"(?!/)[^/]*/[^/]*$").Value;

Second variant:

referrer = string.Join("/", referrer.Split('/').Reverse().Take(2).Reverse());