06. Match Phone Number

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

namespace Study
{
    class Program
    {
        static void Main(string[] args)
        {
            string phonenomber = Console.ReadLine();
            String pattern = @"\+[359]+(-| )[2]\1[\d]{3}\1[\d]{4}\b";

            MatchCollection matches = Regex.Matches(phonenomber, pattern);

            List<string> result = new List<string>();
            foreach (var item in matches)
            {
                result.Add(item.ToString());
            }
            Console.WriteLine(String.Join(", ", result));
        }
    }
}