rec

.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication16
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string recenica = textBox1.Text.ToLower();
            string rec = textBox2.Text.ToLower();

            string modovana = recenica.Insert(0, " ");
            string mod2 = modovana.Insert(modovana.Length, ".");


            if (mod2.Contains(" " + rec + " ") || mod2.Contains(" " + rec + "."))
            {
                MessageBox.Show("Pronadjena je rec " + rec);
            }
            else
            {
                MessageBox.Show("Nije pronadjena rec");
            }
        }
    }
}