问如何编写Regex从Bing搜索结果中提取URL？

EN

@"(?<=<h3 class=\""r\""><a href=\""\/url\?q=)(.*?)(?=&amp;)";

const string regexPattern = @"(?<=<h3 class=\""r\""><a href=\""\/url\?q=)(.*?)(?=&amp;)";

public static string[] TopUrls(string data)
    {
        Regex regex = new Regex(regexPattern);
        MatchCollection collection = regex.Matches(data);
        return collection.Cast<Match>()
            .Select(m => m.Value)
            .ToArray();
    }

string downloadUrl = "https://www.google.com" + "/search?q=" + keyword.ToString() + "&num=" + numResults + "&as_qdr=all&ei=LrUVVf7UMrPfsAS7lICgCw&sa=N&biw=1440&bih=690";
                fetch.Headers.Set(HttpRequestHeader.Host, "www.google.com");
                string data = fetch.DownloadString(downloadUrl);
                string[] results = TopUrls(data);