using System;

using System.Text.RegularExpressions;

public class Program

{

    // see: https://stackoverflow.com/questions/4892452/regex-match-multiple-times-in-string

    public static void Main()

    {

        Regex regex = new Regex("(?<=<<).*?(?=>>)");

​

        foreach (Match match in regex.Matches(

            "this is a test for <<bob>> who like <<books>>"))

        {

            Console.WriteLine(match.Value);

        }

    }

}