Question

Below code works when the regular expression match with the string. What if one of the characters are not there, for example MONEY-STAT is missing?

string s = "MONEY-ID123456:MONEY-STAT43:MONEY-PAYetr-1232832938";
Regex regex =
    new Regex(@"MONEY-ID(?<moneyId>.*?)\:MONEY-STAT(?<moneyStat>.*?)\:MONEY-PAYetr-(?<moneyPaetr>.*?)$");
Match match = regex.Match(s);
if (match.Success)
{
    Console.WriteLine("Money ID: " + match.Groups["moneyId"].Value);


    Console.WriteLine("Money Stat: " + match.Groups["moneyStat"].Value);
    Console.WriteLine("Money Paetr: " + match.Groups["moneyPaetr"].Value);

}

Console.WriteLine("hit <enter>");
Console.ReadLine();

Answer 1

I changed MONEY-STAT to (?:MONEY-STAT)?

MONEY-ID(?<moneyId>.*?)\:(?:MONEY-STAT)?(?<moneyStat>.*?)\:MONEY-PAYetr-(?<moneyPaetr>.*?)$

explain:

(?: subexpression)        Defines a noncapturing group. 
?                         Matches the previous element zero or one time.