从FCKeditor生成HTML字段里获取文章内容和图片

最近在做我们学校微软创新之旅的专题网站，文章内容是从原来的新闻系统里提取的。原来的新闻系统的文本编辑是用的FCKeditor，用户只要直接输入和上传图片就可以生成相关的HTML代码并存入数据库，而我想要将发布的文章的图片提取出来放在桌面，那么就必须将图片地址从HTML的代码里提取出来，同时我还需要去掉HTML标签的文本放入RSS中供用户订阅，所以只能想个办法解决这些问题。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;


/// <summary> 
/// FiterHtml 的摘要说明 
/// </summary> 
public class FiterHtml
{
    public FiterHtml() { }
    ///   <summary> 
    ///   去除HTML标记 
    ///   </summary> 
    public static string NoHTML(string Htmlstring)
    {
        //删除脚本 
        Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "",
          RegexOptions.IgnoreCase);
        //删除HTML 
        Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"([/r/n])[/s]+", "",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "/"",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", "   ",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "/xa1",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "/xa2",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "/xa3",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "/xa9",
          RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&#(/d+);", "",
          RegexOptions.IgnoreCase);
        Htmlstring.Replace("<", "");
        Htmlstring.Replace(">", "");
        Htmlstring.Replace("/r/n", "");
        Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();

        return Htmlstring;
    }
    public static string StripHTML(string strHtml)
    {
        string[] aryReg =
            {
              @"<script[^>]*?>.*?</script>",
              @"<(///s*)?!?((/w+:)?/w+)(/w+(/s*=?/s*(([""'])(//[",
               @"'tbnr]|[^/7])*?/7|/w+)|.{0})|/s)*?(///s*)?>", @"([/r/n])[/s]+", 
                @"&(quot|#34);", @"&(amp|#38);", @"&(lt|#60);", @"&(gt|#62);", 
                @"&(nbsp|#160);", @"&(iexcl|#161);", @"&(cent|#162);", @"&(pound|#163);",
                @"&(copy|#169);", @"&#(/d+);", @"-->", @"<!--.*/n"
            };

        string[] aryRep =
            {
              "", "", "", "/"", "&", "<", ">", "   ", "/xa1",  //chr(161), 
              "/xa2",  //chr(162), 
              "/xa3",  //chr(163), 
              "/xa9",  //chr(169), 
              "", "/r/n", ""
            };

        string newReg = aryReg[0];
        string strOutput = strHtml;
        for (int i = 0; i < aryReg.Length; i++)
        {
            Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase);
            strOutput = regex.Replace(strOutput, aryRep[i]);
        }
        strOutput.Replace("<", "");
        strOutput.Replace(">", "");
        strOutput.Replace("/r/n", "");
        return strOutput;
    }
    ///   <summary> 
    ///   移除HTML标签 
    ///   </summary> 
    ///   <param   name="HTMLStr">HTMLStr</param> 
    public static string ParseTags(string HTMLStr)
    {
        return System.Text.RegularExpressions.Regex.Replace(HTMLStr, "<[^>]*>", "");
    }
    ///   <summary> 
    ///   取出文本中的图片地址 
    ///   </summary> 
    ///   <param   name="HTMLStr">HTMLStr</param> 
    public static string GetImgUrl(string HTMLStr)
    {
        string str = string.Empty;
        string sPattern = @"^<img/s+[^>]*>";
        Regex r = new Regex(@"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>",
          RegexOptions.Compiled);
        Match m = r.Match(HTMLStr.ToLower());
        if (m.Success)
            str = m.Result("${url}");
        return str;
    }

}

测试用例:

protected void Page_Load(object sender, EventArgs e)
   {
       string test = "例：<strong   id=/"abc/">你好</strong><p><a href=/"http://green.njut.edu.cn/images/gslogo.png/" target=/"_blank/">绿荫网</a></p><IMG title=/"绿荫网/" src=/"http://121.9.206.74/Gift/face/2.gif/" border=0>H<EM>i,星烛网</EM>";
       FiterHtml filter = new FiterHtml();
       Response.Write(FiterHtml.NoHTML(test));
   }