Regular Expression Filename Find and Replace

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

namespace RegexFilenames
{
    public partial class frmReplace : Form
    {
        public frmReplace()
        {
            InitializeComponent();
        }

        private RegexOptions options;
        public RegexOptions Options
        {
            get { return options; }
            set { options = value; }
        }

        private string find;
        public string Find
        {
            get { return find; }
            set { find = value; }
        }

        private string replace;
        public string Replace
        {
            get { return replace; }
            set { replace = value; }
        }

        private string directory;
        public string Directory
        {
            get { return directory; }
            set { directory = value; }
        }

        private bool subDirectories;
        public bool SubDirectories
        {
            get { return subDirectories; }
            set { subDirectories = value; }
        }

        private bool testOnly;
        public bool TestOnly
        {
            get { return testOnly; }
            set { testOnly = value; }
        }

        /// <summary>
        /// Replace files on the disk based on properties set on this form.
        /// </summary>
        public void ReplaceFiles()
        {
            // create the regex object
            Regex rex = new Regex(find, options);

            // work out if we are going to be searching sub directories
            SearchOption searchOption = SearchOption.TopDirectoryOnly;
            if (subDirectories)
            {
                searchOption = SearchOption.AllDirectories;
            }

            // find files within the directory
            string[] files = System.IO.Directory.GetFiles(directory, "*.*", searchOption);

            // setup the progress bar
            pbReplace.Maximum = files.Length;

            // iterator for the progress bar
            int i = 0;
            
            // stop painting of the list
            lstReplacements.BeginUpdate();
           
            // process each file
            foreach (string file in files)
            {
                // move the progress bar along
                pbReplace.Value = ++i;

                // find just the file name.. no need to replace anything in the path
                string name = Path.GetFileName(file);

                // does it match the expression?
                if (rex.IsMatch(name))
                {
                    // find out the new name after replacement
                    string newName = rex.Replace(name, replace);

                    // the path that this came from
                    string path = Path.GetDirectoryName(file);

                    // add an item to the list showing the replacement
                    lstReplacements.Items.Add(
                        path + Path.DirectorySeparatorChar + name + " -> " + 
                        path + Path.DirectorySeparatorChar + newName);

                    // don't rename the file if this is only a test run
                    if (!testOnly)
                    {
                        // rename the file
                        File.Move(path + Path.DirectorySeparatorChar + name, 
                            path + Path.DirectorySeparatorChar + newName);
                    }
                }
            }
            // resume painting
            lstReplacements.EndUpdate();
        }
    }
}