using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Text.RegularExpressions;namespace rexurl{    class Program    {        static void Main(string[] args)        {            string regex = @"(?i)http://(\w+\.){2,3}(com(\.cn)?|cn|net)\b";            string content = "http://www.17meiman.com/u/20090313/15/5ad5d3f2-094f-4b01-9c91-a6d4052a8255.html";            Regex re1 = new Regex(regex);            MatchCollection matches = re1.Matches(content);            System.Collections.IEnumerator enu = matches.GetEnumerator();            while (enu.MoveNext() && enu.Current != null)            {                Match match = (Match)(enu.Current);                string str = match.Value;                Console.Write(str);            }            Console.Read();        }    }}