sentenceWithWord

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputWord = Console.ReadLine();
            string input = Console.ReadLine();
            string pattern = string.Format(@"[\w\s]+{0}[\w\s]+[.!?](?=\s)|{1}[\w\s]+[.!?](?=\s)", inputWord, inputWord);
            Regex regex = new Regex(pattern);
            foreach (var item in regex.Matches(input))
            {
                Console.WriteLine(item);
            }

        }
    }
}