例子：

string url = "http://www.baidu.com/";   //这个是我们的URL   
string content = GetRemoteHtmlCode(url); //得到html源码
string Reg="<title>.+?</title>";   //根据title标签正则，得到标题。你这里填写<script>.+?</script>
string title = GetRegValue(Reg, content); //取出title  这里取出来的标题是包含了title标签的

// 传入URL，返回URL的HTML源码

public static string GetRemoteHtmlCode(string url,string encode)
{
    string HtmlCode = "";
    HttpWebRequest wrequest = (HttpWebRequest)WebRequest.Create(url);
    try
    {
        HttpWebResponse wresponse = (HttpWebResponse)wrequest.GetResponse();
        Stream stream = wresponse.GetResponseStream();
        StreamReader reader = new StreamReader(stream, Encoding.GetEncoding(encode));
        HtmlCode = reader.ReadToEnd();
        reader.Close();
        wresponse.Close();
    }
    catch
    {
        HtmlCode = "Error";
    }
    return HtmlCode;
}

//传入网页源码和要提取的正 则，就可以把你想要的内容返回出来

public static string GetRegValue(string RegexString, string RemoteStr)
{
    string MatchVale = "";
    Regex r = new Regex(RegexString);
    Match m = r.Match(RemoteStr);
    if (m.Success)
    {
        MatchVale = m.Value;
    }
    return MatchVale;
}