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

namespace FileIO
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(amountOfWords("the", new StreamReader(@"C:\Users\Sebas\OneDrive\Dokumenter\Visual Studio 2017\Projects\FileIO\The writings of Abraham Lincoln.txt")));
            Console.ReadLine();
        }

        private static int amountOfWords(string word, StreamReader sr)
        {
            int amountUsed = 0;
            using (sr)
            {
                String text = sr.ReadToEnd();
                string regexPattern = @"[Tt]he";
                amountUsed = Regex.Matches(text, regexPattern).Count;
            }

            return amountUsed;
        }
    }
}