{ 
  System.Text.RegularExpressions.Regex regex = 
    new System.Text.RegularExpressions.Regex(#trigger.data.RegexParameter);

  string path = #trigger.data.Path;

  // match to full path! to match to beginning of file name, use System.IO.Path.DirectorySeparatorChar instead of ^
  return string.Join( Environment.NewLine,
    System.IO.Directory.GetFiles( path, "*.*" )
      .Where( path => regex.IsMatch(path) )
      .ToList()
  );  
}