Using Regular Expression for Parsing

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

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

        private void buttonClose_Click(object sender, EventArgs e)
        {
            Close();
        }
        private bool FHasRtf = false; // �Ƿ�����Ѿ����ɵ�Rtf
        private bool FHasHtml = false; // �Ƿ�����Ѿ����ɵ�Html

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            FHasRtf = false;
            FHasHtml = false;
        }

        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            CSharpEngine vCSharpEngine;
            CSharpHighlight vCSharpHighlight;
            switch (((TabControl)sender).SelectedIndex)
            {
                case 1: //rtf
                    if (FHasRtf) return;
                    vCSharpEngine = new CSharpEngine();
                    vCSharpEngine.Analyze(textBox1.Text);
                    vCSharpHighlight = new CSharpHighlight(vCSharpEngine, new Font("Courier New", 10));
                    richTextBox1.Rtf = vCSharpHighlight.MakeRtf();
                    FHasRtf = true;
                    break;
                case 2: //html
                    if (FHasHtml) return;
                    vCSharpEngine = new CSharpEngine();
                    vCSharpEngine.Analyze(textBox1.Text);
                    vCSharpHighlight = new CSharpHighlight(vCSharpEngine, new Font("Courier New", 10));
                    webBrowser1.DocumentText = vCSharpHighlight.MakeHtml();
                    FHasHtml = true;
                    break;
            }
        }
    }
}