C#

private enum DataMatches
{
  Header = 0,
  Blank = 1,
  Total = 2,
  Sum = 3,
  NewData = 4,
  Data = 5,
  Unmatched = 99
}
        
private static void SetupRegex()
{
  if (dataPatterns != null && dataPatterns.Count > 0) return;

  dataPatterns = new Dictionary<string, DataMatches>();
  dataPatterns.Add(@"^(D|""D|T|S|I|E|""Z)", DataMatches.Header);
  dataPatterns.Add(@"^$", DataMatches.Blank);
  dataPatterns.Add(@"^""To", DataMatches.Total);
  dataPatterns.Add(@"^""\d\d/\d\d/\d\d\d\d"","""",", DataMatches.Sum);
  dataPatterns.Add(@"^""\d\d/\d\d/\d\d\d\d"",", DataMatches.NewData);
  dataPatterns.Add(@"^"""",""\w", DataMatches.Data);
}

private static DataMatches Classify(string s)
{
  SetupRegex();
  foreach (KeyValuePair<string, DataMatches> kvp in dataPatterns)
  {
    if (Regex.IsMatch(kvp.Key)) return kvp.Value;
  }
  return DataMatches.Unmatched;
}

private enum DataMatches
{  
    [RegExAttribute("pattern",Options=options)]
    Header = 0
,

static Regex myRegex = new Regex("");
public static int Bar()
{
    return myRegex.GetHashCode();
}

public static int Foo()
{
    Regex myRegex = new Regex("");
            return myRegex.GetHashCode();
}