QueryMess

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

namespace QueryMess
{
    class QueryMess
    {
        static void Main(string[] args)
        {
            Dictionary<int, Dictionary<string, List<string>>> info =
                new Dictionary<int, Dictionary<string, List<string>>>();

            string inputLine = Console.ReadLine();
            int dicCounter = 0;
            while (!inputLine.Equals("END"))
            {
                info[dicCounter] = new Dictionary<string, List<string>>();

                string[] splittedInput = inputLine.
                    Split(new char[] { '&' , '?'}, StringSplitOptions.RemoveEmptyEntries).ToArray();

                string key = string.Empty;
                string value = string.Empty;
                foreach (string input in splittedInput)
                {
                    if (Regex.IsMatch(input, @"(.*?)=(.*)"))
                    {
                        Match match = Regex.Match(input, @"(.*?)=(.*)");
                        key = match.Groups[1].ToString();
                        value = match.Groups[2].ToString();

                        key = Regex.Replace(key, @"((%20*\+*)|(\+))+", "");
                        key = Regex.Replace(key, @"\s*", "");

                        value = Regex.Replace(value, @"((%20*\+*)|(\+))+", " ");
                        value = Regex.Replace(value, @"\s+", " ");
                        value = value.Trim();

                        if (!info[dicCounter].ContainsKey(key))
                        {
                            info[dicCounter].Add(key, new List<string>());
                            info[dicCounter][key].Add(value);
                        }
                        else
                        {
                            info[dicCounter][key].Add(value);
                        }
                    }
                }

                inputLine = Console.ReadLine();
                dicCounter++;
            }

            foreach (int currLine in info.Keys)
            {
                foreach (KeyValuePair<string, List<string>> pair in info[currLine])
                {
                    Console.Write($"{pair.Key}=[{string.Join(", ", pair.Value)}]");
                }
                Console.WriteLine();
            }
        }
    }
}