Match Collection Basic

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

namespace MarchFourteen
{
    class Program
    {
        static void Main(string[] args)
        {
            string pattern = @"\d";
            Regex regex = new Regex(pattern);

            string text = "Hi there, my number is 12314";

            MatchCollection matchCollection = regex.Matches(text);

            Console.WriteLine($"{matchCollection.Count} hits found:\n{text}");

            foreach(Match hit in matchCollection)
            {
                GroupCollection group = hit.Groups;
                Console.WriteLine($"{group[0].Value} found at {group[0].Index}");
            }

            Console.ReadLine();
        }
    }
}