Remove All Text Before/After Certain Point

To remove everything before first /

input = input.Substring(input.IndexOf("/"));

To remove everything after first /

input = input.Substring(0, input.IndexOf("/")+1);

To remove everything before last /

input = input.Substring(input.LastIndexOf("/"));

To remove everything after last /

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