04.TreasureMap vers.2

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace _04.TreasureMap
{
    public class TreasureMap
    {
        public static void Main()
        {
            string pattern = @"([!|#])[^!#]*?\b(?<street>[A-Za-z]{4})\b[^!#]*[^\d](?<number>\d{3})-(?<pass>\d{6}|\d{4})(?:[^\d!#][^!#]*)?[^\1]?";
            var regex = new Regex(pattern);
            var output = new StringBuilder();

            var n = int.Parse(Console.ReadLine().Trim());
            for (int line = 0; line < n; line++)
            {
                var inputLine = Console.ReadLine();

                if (regex.IsMatch(inputLine))
                {
                    var matches = regex.Matches(inputLine);
                    var mostInnerValidIndex = matches.Count / 2;
                    var validMessage = matches[mostInnerValidIndex];

                    var streetName = validMessage.Groups["street"].Value;
                    var streetNumber = validMessage.Groups["number"].Value;
                    var pass = validMessage.Groups["pass"].Value;
                    output.AppendLine($"Go to str. {streetName} {streetNumber}. Secret pass: {pass}.");
                }
            }

            Console.WriteLine(output.ToString().Trim());
        }
    }
}