Validatore codice fiscale in linguaggio C#

CheckCodiceFiscale.cs

    /// <summary>
		///   Computes checksum validity on an Italian Fiscal Code
		/// </summary>
		/// <param name="fiscalCode">The Fiscal Code to be checked</param>
		/// <returns>Checksum is valid</returns>
		/// <remarks>Checksum routines are at https://en.wikipedia.org/wiki/Italian_fiscal_code_card</remarks>
    /// <remarks>Used regular expression is at http://blog.marketto.it/2016/01/regex-validazione-codice-fiscale-con-omocodia/</remarks>
		private bool IsFiscalCodeOk(string fiscalCode)
		{
      const string regex = @"/^(?:[B-DF-HJ-NP-TV-Z](?:[AEIOU]{2}|[AEIOU]X)|[AEIOU]{2}X|[B-DF-HJ-NP-TV-Z]{2}[A-Z]){2}[\dLMNP-V]{2}(?:[A-EHLMPR-T](?:[04LQ][1-9MNP-V]|[1256LMRS][\dLMNP-V])|[DHPS][37PT][0L]|[ACELMRT][37PT][01LM])(?:[A-MZ][1-9MNP-V][\dLMNP-V]{2}|[A-M][0L](?:[\dLMNP-V][1-9MNP-V]|[1-9MNP-V][0L]))[A-Z]$/i";
			if (!Regex.IsMatch(fiscalCode, regex))
				return false;

			#region static maps

			var oddMap = new Dictionary<char, int>() {
				{'0', 1},
				{'1', 0},
				{'2', 5},
				{'3', 7},
				{'4', 9},
				{'5', 13},
				{'6', 15},
				{'7', 17},
				{'8', 19},
				{'9', 21},
				{'A', 1},
				{'B', 0},
				{'C', 5},
				{'D', 7},
				{'E', 9},
				{'F', 13},
				{'G', 15},
				{'H', 17},
				{'I', 19},
				{'J', 21},
				{'K', 2},
				{'L', 4},
				{'M', 18},
				{'N', 20},
				{'O', 11},
				{'P', 3},
				{'Q', 6},
				{'R', 8},
				{'S', 12},
				{'T', 14},
				{'U', 16},
				{'V', 10},
				{'W', 22},
				{'X', 25},
				{'Y', 24},
				{'Z', 23}
			};

			var evenMap = new Dictionary<char, int>() {
				{'0', 0},
				{'1', 1},
				{'2', 2},
				{'3', 3},
				{'4', 4},
				{'5', 5},
				{'6', 6},
				{'7', 7},
				{'8', 8},
				{'9', 9},
				{'A', 0},
				{'B', 1},
				{'C', 2},
				{'D', 3},
				{'E', 4},
				{'F', 5},
				{'G', 6},
				{'H', 7},
				{'I', 8},
				{'J', 9},
				{'K', 10},
				{'L', 11},
				{'M', 12},
				{'N', 13},
				{'O', 14},
				{'P', 15},
				{'Q', 16},
				{'R', 17},
				{'S', 18},
				{'T', 19},
				{'U', 20},
				{'V', 21},
				{'W', 22},
				{'X', 23},
				{'Y', 24},
				{'Z', 25}
			};

			#endregion static maps

			int total = 0;
			for (int i = 0; i < 15; i += 2)
				total += oddMap[fiscalCode[i]];
			for (int i = 1; i < 15; i += 2)
				total += evenMap[fiscalCode[i]];

			return fiscalCode[15] == (char)('A' + total % 26);
		}