02.Extract Sentences by Keyword

using System;
using System.Text.RegularExpressions;

namespace _02.ExtractSentencesByKeyWord
{
    class ExtractSentencesByKeyWord
    {
        static void Main()
        {
            string word = Console.ReadLine();
            Regex pattern = new Regex($@"\b[^.?!]+\b {word} \b[^.?!]+\b");

            string text = Console.ReadLine();

            MatchCollection matches = pattern.Matches(text);

            foreach (Match match in matches)
            {
                string sentence = match.Value.Trim();
                Console.WriteLine(sentence);
            }
        }
    }
}