public static void Main(string[] args)
{
string[] inputArray = System.IO.File.ReadAllText(@"../../../../input.txt").Split("\n");
int validPasswordCount = 0;
foreach (string line in inputArray)
{
UserPasswordRecord userPasswordRecord = new UserPasswordRecord();
userPasswordRecord.PasswordPolicy = new PasswordPolicy();
//BEHOLD THE POWER OF THE REGEX
Regex regex = new Regex(@"^(\d+)-(\d+)\s([a-zA-Z]):\s([a-zA-Z]*)");
Match match = regex.Match(line);
while (match.Success)
{
userPasswordRecord.PasswordPolicy.PossibleCharacterPositionOne = match.Groups[1].ToString();
userPasswordRecord.PasswordPolicy.PossibleCharacterPositionTwo = match.Groups[2].ToString();
userPasswordRecord.PasswordPolicy.RequiredCharacter = match.Groups[3].ToString();
userPasswordRecord.Password = match.Groups[4].ToString();
if (IsPasswordValid(userPasswordRecord))
{
validPasswordCount++;
}
match = match.NextMatch();
}
}
Console.WriteLine("There are " + validPasswordCount + " valid passwords");
}
private static bool IsPasswordValid(UserPasswordRecord userPasswordRecord)
{
int indexOne = 0;
int indexTwo = 0;
bool indexOneEqual = false;
bool indexTwoEqual = false;
if (int.TryParse(userPasswordRecord.PasswordPolicy.PossibleCharacterPositionOne, out indexOne) && int.TryParse(userPasswordRecord.PasswordPolicy.PossibleCharacterPositionTwo, out indexTwo))
{
//Decrement for zero indexing
indexOne--;
indexTwo--;
if (string.Equals(userPasswordRecord.Password.ToCharArray()[indexOne].ToString(), userPasswordRecord.PasswordPolicy.RequiredCharacter))
{
indexOneEqual = true;
}
if (string.Equals(userPasswordRecord.Password.ToCharArray()[indexTwo].ToString(), userPasswordRecord.PasswordPolicy.RequiredCharacter))
{
indexTwoEqual = true;
}
if ((indexOneEqual && !indexTwoEqual) || (!indexOneEqual && indexTwoEqual))
{
return(true);
}
}
return(false);
}