Example_6_Regex

using System;
using System.Text.RegularExpressions;

namespace Regular_Expression
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] sites = {
                "http://www.google.com",
                "https://www.google.com",
                "http://google.com",
                "www.google.com",
                "google.com"
            };

            for (int i = 0; i < sites.Length; i++)
            {
                string pattern = @"(http)?(s)?(://)?(w{3}\.)?\w+\.\w+";
                bool ismatch = Regex.IsMatch(sites[i], pattern);
                Console.WriteLine(ismatch);
            }
            Console.ReadLine();
        }
    }
}