1  namespace Utils
 2  {
 3      public static class Str
 4      {
 5          public static string Between(string input, string open, string close)
 6          {
 7              var openI = input.IndexOf(open);
 8              if (openI == -1) return input;
 9              var openIndex = openI + open.Length;
10              var closeIndex = input.LastIndexOf(close);
11              if (closeIndex == -1) return input;
12  
13              return input.Substring(openIndex, closeIndex - openIndex);
14          }
15      }
16  }