C#

string strPath = AppDomain.CurrentDomain.BaseDirectory + @"UserImages\";
// check the directory existence
if(!Directory.Exists(strPath))
	Directory.CreateDirectory(strPath);
//...your file copy code here...
// eg. 
//   File.Copy("d:\\a.txt", strPath + "b.txt");

string str = "%alan#23%12:34:50#ab %regular#]r";

Regex RE = new Regex(@"(\%+)\#");
MatchCollection MC = RE.Matches(str);

if (MC.Count == 0) MessageBox.Show("No match");
foreach (Match M in MC)
{
    MessageBox.Show(M.ToString());
}

Christian Graus wrote:

grouping in regex

8.Kelvin()
{   
  while (!(the machine can program itself))
     Wont_stop_coding = true;
}

Regex RE = new Regex(@"(\%(\w|\: )+)\#");<br />

8.Kelvin()
{   
  while (!(the machine can program itself))
     Wont_stop_coding = true;
}