[C ＃] use regular verification content

// Check regular 
const string CardIdParttern = @"(\d{6})(\d{4})(\d{2})(\d{2})(\d{2})(\d{1})([\d,x,X]{1})";
// Use regular matching CardID character string 
Match match = Regex.Match(CardID, CardIdParttern);
if (match.Success)｛
    // If the matching processing logic 
｝