02.Regular ExpressionsLab-Match Phone Number

02. Match Phone Number
Write a regular expression to match a valid phone number from Sofia. After you find all valid phones, print them on the console, separated by a comma and a space “, ”.
Compose the Regular Expression
A valid number has the following characteristics:
• It starts with "+359"
• Then, it is followed by the area code (always 2)
• After that, it’s followed by the number itself:
o   The number consists of 7 digits (separated in two groups of 3 and 4 digits respectively).
• The different parts are separated by either a space or a hyphen ('-').
You can use the following RegEx properties to help with the matching:
• Use quantifiers to match a specific number of digits
• Use a capturing group to make sure the delimiter is only one of the allowed characters (space or hyphen) and not a combination of both (e.g. +359 2-111 111 has mixed delimiters, it is invalid). Use a group backreference to achieve this.
• Add a word boundary at the end of the match to avoid partial matches (the last example on the right-hand side).
• Ensure that before the '+' sign there is either a space or the beginning of the string.

Examples
Input
+359 2 222 2222,359-2-222-2222, +359/2/222/2222, +359-2 222 2222 +359 2-222-2222, +359-2-222-222, +359-2-222-22222 +359-2-222-2222
Output
+359 2 222 2222, +359-2-222-2222

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

public class Program
{
    public static void Main()
    {
         var pattern = @"\+359(-| )2\1\d{3}\1\d{4}\b";   // (-| ) може да е без или |, но  се добавят [], т.е. ([- ])
         var phonesNumbers = Console.ReadLine();

         var numbersMatches = Regex.Matches(phonesNumbers, pattern);
         //var counter = 0;
         //foreach (Match item in numbersMatches)
         //{
         //    counter++;
         //    if (numbersMatches.Count != counter)
         //    {
         //        Console.Write(item.Value + ", ");
         //    }
         //    else
         //    {
         //        Console.WriteLine(item.Value);
         //    }
         //}            //Чрез Cast<Match>() достъпвам директно без да форийчвам до collection, а чрез Select(x => x.Value) до item
         var matchedPhones = numbersMatches.Cast<Match>().Select(x => x.Value.Trim()).ToArray();
         Console.WriteLine(string.Join(", ", matchedPhones));
    }
}