18

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

namespace TFYA_lab18
{
    class Program
    {
        static void Main(string[] args)
        {
            string text = "";
            string[] randWords = new string[] { "program", "new", "old", "strong", "weak", "powerful", "music" };
            using (StreamReader sr = new StreamReader(@"D:\Нужное\ТФЯ\lab18\var5.txt", Encoding.UTF8))
            {
                text = sr.ReadToEnd();
            }
            Console.WriteLine("Введите слово для поиска");
            string search = Console.ReadLine();
            MatchCollection matches = Regex.Matches(text, search);
            Random r = new Random();
            text = Regex.Replace(text, search, randWords[r.Next(0, 7)]);
            Console.WriteLine($"Количество совпадений с заданным словом - {matches.Count}\nСтрока с заменами:\n{text}");
        }
    }
}