Match_Dates(regex_80%)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Match_Dates
{
    class Program
    {
        static void Main(string[] args)
        {
            string pattern = @"([0-9]{2}[\/][A-Z]{1}[a-z]{2}[\/][0-9]{4})|([0-9]{2}[\-][A-Z]{1}[a-z]{2}[\-][0-9]{4})|([0-9]{2}[\.][A-Z]{1}[a-z]{2}[\.][0-9]{4})";

            string input = Console.ReadLine();

            MatchCollection days = Regex.Matches(input, pattern);

            Dictionary<string, Dictionary<string, string>> store =
                new Dictionary<string, Dictionary<string, string>>();
            foreach (Match data in days)
            {
                string[] tokens = data.Value.Split('/', '.', '-');
                string day = tokens[0];
                string month = tokens[1];
                string year = tokens[2];

                if (!store.ContainsKey(day))
                {
                    store.Add(day, new Dictionary<string, string>());
                }
                store[day][month] = year;
            }
            foreach (var data in store)
            {
                Console.Write($"Day: {data.Key}, ");
                Dictionary<string, string> second = data.Value;
                foreach (var entry in second)
                {
                    Console.Write($"Month: {entry.Key}, Year: {entry.Value}");
                }
                Console.WriteLine();
            }
        }
    }
}