c#正则表达式

   string strResult ; 

   string strURL = "http://www.yahoo.com.cn/index.html";   HttpWebRequest myReq =  (HttpWebRequest)HttpWebRequest.Create(strURL);   myReq.Timeout = 2000;   HttpWebResponse  myRes = (HttpWebResponse)myReq.GetResponse();   Stream myStream = (Stream)myRes.GetResponseStream () ;     StreamReader sr = new StreamReader(myStream,System.Text.Encoding.UTF8 );

   StringBuilder strBuilder = new StringBuilder();

   while (-1 != sr.Peek())

   {

    strBuilder.Append(sr.ReadLine()+"/r/n");

   }

 

      strResult = strBuilder.ToString();    this.textBox4.Text =  strResult;   //string xx = "http://([/w-]+/.)+[/w-]+(/[/w- ./?%&=]*)? ";

   Regex reg = new Regex(@"http://([/w-]+/.)+[/w-]+(/[/w- ./?%&=]*)?");

   char[] xx = {'h','r','e','f'};   String[] strArr = strResult.Split(xx);      //his.textBox3.Text = SniffWebUrl( strResult,"","");

   //reg.Match() ;      MatchCollection  mc;   mc = reg.Matches(strResult);

   //this.listBox1.Items.Add("xxxxxxxxxxxxxxx") ;   for (int i=0;i< mc.Count ;i++)   {    this.listBox1.Items.Add(mc[i].Index);    this.listBox1.Items.Add(mc[i].Value);   }