效果图

实现代码
protected void Button1_Click(object sender, EventArgs e)
...{
Uri u = new Uri("http://www.google.cn/search?q="+TextBox1.Text+"&hl=zh-CN&ie=GB2312&lr=&nxpt=10.2068337957705091425725");
HttpWebRequest dd = (HttpWebRequest)WebRequest.Create(u);
dd.Method = "GET";
WebResponse req = dd.GetResponse();
Stream str = req.GetResponseStream();
StreamReader readerOfStream = new StreamReader(str, System.Text.Encoding.GetEncoding("GB2312"));
string aa = readerOfStream.ReadToEnd();
string abc = "";
char aa1=(char)13;
char aa2=(char)10;
string Str = aa.Replace(aa1.ToString(), "").Replace(aa2.ToString(), "");

string StartStr = "<div><div class=g>[变量]";
StartStr = StartStr.Replace("[变量]", ".*");
string LastStr = "</div>";
string SearchStr = StartStr + ".*" + LastStr;
Regex re = new Regex(SearchStr, RegexOptions.IgnoreCase);
Match m = re.Match(aa);
Response.Write(m.Value);
str.Close();
}
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