C# code,Regular Expression,obatin special url from html string

gistfile1.cs

//gdfgfdg<a href="/excel/dsfsf-).xls">/excel/dsfsf-).xls</a>dsfdsfdsf....
internal class Program
{
    public static string source = @"C:\Users\JBian\Documents\visual studio 2010\Projects\ConsoleApplication23\ConsoleApplication23\Files\source.txt";
    public static string result = @"C:\Users\JBian\Documents\visual studio 2010\Projects\ConsoleApplication23\ConsoleApplication23\Files\result.txt";

    private static void Main(string[] args)
    {
        StreamReader sd = new StreamReader(source);
        string pattern1 = "(<a href=\"\\/excel\\/[\\w|\\-|\\(|\\)]+\\.(xls|html)\">[\\w|\\-|\\(|\\)]+\\.(xls|html)</a>)";
        Regex reg1 = new Regex(pattern1, RegexOptions.IgnoreCase);
        var qq = reg1.Matches(sd.ReadToEnd());
        string str = string.Empty;
        for (int i = 0; i < qq.Count; i++)
        {
            string cap = qq[i].Value;
            string pattern2 = "[\\w|\\-|\\(|\\)]+\\.(xls|html)";
            Regex reg2 = new Regex(pattern2, RegexOptions.IgnoreCase);
            if (reg2.Match(cap).Success)
            {
                string result = reg2.Match(cap).Value;
                Console.WriteLine(result);
                str += result + Environment.NewLine;
            }
        }
        OutputResult(str);
        Console.ReadKey();
    }

    private static void OutputResult(string str)
    {
        using (StreamWriter sw = new StreamWriter(result))
        {
            sw.WriteLine(str + Environment.NewLine);
            sw.Flush();
        }
    }
}