Exam 2015 (Regex)

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

class Problem04
{
    static void Main()
    {
        var srubskoInfo = new Dictionary<string, Dictionary<string, long>>();

        Regex validation = new Regex(@"((([a-zA-Z])+\s))+@(([a-zA-Z])+\s{0,1}([a-zA-Z]))*(\s[0-9]+)+");
        Regex foundVenue = new Regex(@"@([a-zA-z]+\s)+");
        Regex foundPerformer = new Regex(@"^([a-zA-z]+)(\s*[a-zA-z])*");
        Regex foundTicketsData = new Regex(@"\d+\s\d+");

        string input = Console.ReadLine();

        while (input != "End")
        {
            if (validation.IsMatch(input))
            {
                var performerName = foundPerformer.Match(input).Value.Trim();
                var moneyData = foundTicketsData.Match(input).Value.Split();
                var performingPlaceAsArr = foundVenue.Match(input).Value.Split(new [] { '@', ' '}, StringSplitOptions.RemoveEmptyEntries);
                var performingPlace = string.Join(" ", performingPlaceAsArr);
                long money = long.Parse(moneyData[0]) * long.Parse(moneyData[1]);


                if (!srubskoInfo.ContainsKey(performingPlace))
                {
                    srubskoInfo[performingPlace] = new Dictionary<string, long>();
                }
                if (!srubskoInfo[performingPlace].ContainsKey(performerName))
                {
                    srubskoInfo[performingPlace].Add(performerName,money);
                }
                else
                {
                    srubskoInfo[performingPlace][performerName] += money;
                }
            }
            else
            {
                input = Console.ReadLine();
                continue;
            }

            input = Console.ReadLine();
        }

        foreach (var city in srubskoInfo)
        {
            Console.WriteLine(city.Key);

            foreach (var pair in city.Value.OrderByDescending(pair => pair.Value))
            {
                Console.WriteLine("#  {0} -> {1}", pair.Key, pair.Value);
            }
        }

    }
}