using System;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var input = "SOME domain at HTTP://www.example.com/home/index is first candidate, and http://www.example2.com/other/account is second http candidate";

        var words = input.Split(new[]{' '})

            .Select(w => w.ToLower())

            .Where(w => w.Contains("http://"))

            .Select(w => w.Substring(w.IndexOf("http://")+7))

            .Select(w => w.Substring(0, w.IndexOf("/")));

        foreach(var word in words)

            Console.WriteLine(word);

    }

}