UBB(c#完整版)

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace myluntan
{
 /// <summary>
 /// UBB 的摘要说明。
 /// </summary>
 public class UBB
 {
  public UBB()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }
   
  #region 公共静态方法
  /// <summary>
  /// UBB代码处理函数
  /// </summary>
  /// <param name="sDetail">输入字符串</param>
  /// <returns>输出字符串</returns>
  public string UBBToHTML(string sDetail)
  {
   Regex r;
   Match m;
   #region 处理空格
   sDetail = sDetail.Replace(" ","&nbsp;");
   #endregion
   #region 处理单引号
   sDetail = sDetail.Replace("'","’");
   #endregion
   #region 处理双引号
   sDetail = sDetail.Replace(""","&quot;");
   #endregion
   #region html标记符
   sDetail = sDetail.Replace("<","&lt;");
   sDetail = sDetail.Replace(">","&gt;");
   
   #endregion
   #region 处理换行
   //处理换行，在每个新行的前面添加两个全角空格
   r = new Regex(@"(rn((&nbsp;)|　)+)(?<正文>S+)",RegexOptions.IgnoreCase);
   for (m = r.Match(sDetail); m.Success; m = m.NextMatch())
   {
    sDetail = sDetail.Replace(m.Groups[0].ToString(),"<BR>　　" + m.Groups["正文"].ToString());
   }
   //处理换行，在每个新行的前面添加两个全角空格
   sDetail = sDetail.Replace("rn","<BR>");
   #endregion
   #region 处[b][/b]标记
   r = new Regex(@"([b])([ St]*?)([/b])",RegexOptions.IgnoreCase);
   for (m = r.Match(sDetail); m.Success; m = m.NextMatch())
   {
    sDetail = sDetail.Replace(m.Groups[0].ToString(),"<B>" + m.Groups[2].ToString() + "</B>");
   }
   #endregion
   #region 处[i][/i]标记
   r = new Regex(@"([i])([ St]*?)([/i])",RegexOptions.IgnoreCase);
   for (m = r.Match(sDetail); m.Success; m = m.NextMatch())
   {
    sDetail = sDetail.Replace(m.Groups[0].ToString(),"<I>" + m.Groups[2].ToString() + "</I>");
   }
   #endregion
   #region 处[u][/u]标记
   r = new Regex(@"([U])([ St]*?)([/U])",RegexOptions.IgnoreCase);
   for (m = r.Match(sDetail); m.Success; m = m.NextMatch())
   {
    sDetail = sDetail.Replace(m.Groups[0].ToString(),"<U>" + m.Groups[2].ToString() + "</U>");
   }
   #endregion
   #region 处[p][/p]标记
   //处[p][/p]标记
   r = new Regex(@"((rn)*[p])(.*?)((rn)*[/p])",RegexOptions.IgnoreCase|RegexOptions.Singleline);
   for (m = r.Match(sDetail); m.Success; m = m.NextMatch())
   {
    sDetail = sDetail.Replace(m.Groups[0].ToString(),"<P class="pstyle">" +