AUTOMATA_ChatBox [DONE] BAUTISTANAS

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

namespace AUTOMATA_ChatBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string FilterWord(string text)
        {
            string pattern = @"([yY\s]+[aA@4\s]+[wW\s]+[aA@4]+)|" +
                            @"([aA@4\s]+[wW\s]+[aA@4\s]+[yY]+)|" +
                            @"([bB\s]+[oOuU0\s]+[aA@4\s]+[nN\s]+[gG6]+)|" +
                            @"([nN\s]+[gG6\s]+[aA@4\s]+[oOuU0\s]+[bB]+)|" +
                            @"([pP\s]+[iI1!\s]+[sS5$&zZ\s]+[tT+\s]+[iI1!]+)|" +
                            @"([iI1!\s]+[tT+\s]+[sS5$&zZ\s]+[iI1!\s]+[pP]+)|" +
                            @"([fF\s]+[uUvV\s]+[cC(<\s]+[kK]+)|" +
                            @"([kK\s]+[cC(<\s]+[uUvV\s]+[fF]+)";

            string replace = string.Empty;
            Regex reg = new Regex(pattern);
            int i = 0;
            while (i <= reg.Match(text, 0, text.Length).Length - 1)
            {
                replace += "*";
                i++;
            }
            return reg.Replace(text, replace);
        }

        private bool IsInvalidWord(string invalid)
        {
            return true;
        }
        private void btnSend_Click(object sender, EventArgs e)
        {
            int flag = IsInvalidWord(FilterWord(txttext.Text)) ? 1 : 0;
            switch (flag)
            {
                case 0:
                    if (IsInvalidWord(FilterWord(txttext.Text)))
                    {
                        goto default;
                    }
                    else
                    {
                        rtbdispaly.Text += "\r\n>>" + txttext.Text;
                    }
                    break;
                default:
                    rtbdispaly.Text += "\r\n>>" + FilterWord(txttext.Text);
                    break;
            }
            rtbdispaly.SelectionStart = rtbdispaly.Text.Length;
            rtbdispaly.ScrollToCaret();
            txttext.Clear();
            txttext.Focus();
        }


    }
}