C#

private void timer1_Tick(object sender, EventArgs e) {
    label1.Visible = !label1.Visible;
}

//  using System.Text.RegularExpressions;

/// <summary>
///  Regular expression built for C# on: Sat, Feb 26, 2011, 07:38:05 AM
///  Using Expresso Version: 3.0.3634, http://www.ultrapico.com
///  
///  A description of the regular expression:
///  
///  [Protocol]: A named capture group. [\w+]
///      Alphanumeric, one or more repetitions
///  :\/\/
///      :
///      Literal /
///      Literal /
///  [Domain]: A named capture group. [[\w@][\w.:@]+]
///      [\w@][\w.:@]+
///          Any character in this class: [\w@]
///          Any character in this class: [\w.:@], one or more repetitions
///  Literal /, zero or one repetitions
///  Any character in this class: [\w\.?=%&=\-@/$,], any number of repetitions
///  
///
/// </summary>
public static Regex regex = new Regex(
      "(?<Protocol>\\w+):\\/\\/(?<Domain>[\\w@][\\w.:@]+)\\/?[\\w\\."+
      "?=%&=\\-@/$,]*",
    RegexOptions.IgnoreCase
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );


// This is the replacement string
public static string regexReplace = 
      "<Hello>";


//// Replace the matched text in the InputText using the replacement pattern
// string result = regex.Replace(InputText,regexReplace);

//// Split the InputText wherever the regex matches
// string[] results = regex.Split(InputText);

//// Capture the first Match, if any, in the InputText
// Match m = regex.Match(InputText);

//// Capture all Matches in the InputText
// MatchCollection ms = regex.Matches(InputText);

//// Test to see if there is a match in the InputText
// bool IsMatch = regex.IsMatch(InputText);

//// Get the names of all the named and numbered capture groups
// string[] GroupNames = regex.GetGroupNames();

//// Get the numbers of all the named and numbered capture groups
// int[] GroupNumbers = regex.GetGroupNumbers();

String str= Encoding.ASCII.GetString(buffer, 0, bytes);

int bytes = socket.Receive(buffer);

do
            {
                bytes = s.Receive(buffer);
                if (bytes > 0)
                {
                    System.Text.ASCIIEncoding ascii = new ASCIIEncoding();
                    string url =    ascii.GetString(buffer, 0, bytes);

                    try
                    {
                        url = url.Substring(url.IndexOf("GET") + 4, url.IndexOf("HTTP") - (url.IndexOf("GET") + 3) - 1);
                        Console.WriteLine("http//:" + url);
                    }
                    catch { }
                }
            } while (bytes > 0);

Luc Pattyn wrote:

generating permutations is something that suits recursion