using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            string sPattern = @"\bcow\b";
            string[] sentences = { "coward", "lol cow heh", "lolcow", "cowlol", "cow lol", "cow" };

            foreach (string s in sentences)
            {
                System.Console.Write("{0,24}", s);

                if (System.Text.RegularExpressions.Regex.IsMatch(s, sPattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase))
                {
                    System.Console.WriteLine("  (match for '{0}' found)", sPattern);
                }
                else
                {
                    System.Console.WriteLine();
                }
            }


        }
    }
}