17._5正则表达式的替换

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace _17._5正则表达式的替换
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "Welcome to ***ww****w*********************";
            string pattern = @"\bw{3}\.\w+\.(com|net|org)\b";
            string replacment ="\n"+@"http://$&";

            Console.WriteLine("替换前的字符串"+input);
            Console.WriteLine("替换后的字符串");
            Console.WriteLine(Regex.Replace(input,pattern,replacment));
            Console.WriteLine("替换后的字符串1："+(Regex.Replace(input,pattern,replacment,RegexOptions.IgnoreCase)).ToLower());
            Console.WriteLine("替换后的字符串2："+Regex.Replace(input,"www","\n"+@"http://www.",RegexOptions.IgnoreCase));

            Regex myregex = new Regex(pattern,RegexOptions.IgnoreCase);
            string result = myregex.Replace(input, replacment);
            Console.WriteLine("替换后的字符串3："+result.ToLower());

            Console.ReadKey();
        }
    }
}