正则替换 html

正则表达式，去除所有HTML标签

 protected string str = "<table><tr><td>sdasasdsdd</td></tr></table><br><p>sds</p><img id='img1' src='http://www.baidu.com/img/baidu_logo.gif' width='100' height='50' alt=''>aaassss<br><img src='http://www.baidu.com/img/baidu_logo.gif' width='100' height='50' alt=''> 说是道 ";

    protected void Page_Load(object sender, EventArgs e)
    {

        //string regexstr = @"<[^>]*>";    //去除所有的标签

        //@"<script[^>]*?>.*?</script >" //去除所有脚本，中间部分也删除
        
        // string regexstr = @"<img[^>]*>";   //去除图片的正则

       // string regexstr = @"<(?!br).*?>";   //去除所有标签，只剩br

        // string regexstr = @"<table[^>]*?>.*?</table>";   //去除table里面的所有内容

        string regexstr = @"<(?!img|br|p|/p).*?>";   //去除所有标签，只剩img,br,p
  
        str = Regex.Replace(str, regexstr, string.Empty, RegexOptions.IgnoreCase);

    }

function ExecReg(re, content)
     Dim myRegExp, ResultString
     Set myRegExp = New RegExp
     myRegExp.Global = True
     myRegExp.Pattern = re
     ResultString = myRegExp.Replace(content, "" )
     ExecReg = ResultString
end function

function DecodeFilter(html)
         html = LCase (html)
' 去除所有客户端脚本javascipt,vbscript,jscript,js,vbs,event,
         html = ExecReg( " </?script[^>]*> " , html)
         html = ExecReg( " (javascript|jscript|vbscript|vbs): " , html)
         html = ExecReg( " on(mouse|exit|error|click|key) " , html)
         html = ExecReg( " &# " , html)
' 去除表格<table><tr><td><th><a><p><img><div>
         html = ExecReg( " </?table[^>]*> " , html)
         html = ExecReg( " </?tr[^>]*> " , html)
         html = ExecReg( " </?th[^>]*> " , html)
         html = ExecReg( " </?td[^>]*> " , html)
         html = ExecReg( " </?a[^>]*> " , html)
         html = ExecReg( " </?p[^>]*> " , html)
         html = ExecReg( " </?img[^>]*> " , html)
         html = ExecReg( " </?div[^>]*> " , html)
         html = ExecReg( " </?ul[^>]*> " , html)
         html = ExecReg( " </?li[^>]*> " , html)
         html = ExecReg( " </?tbody[^>]*> " , html)
         html = ExecReg( " </?h1[^>]*> " , html)
         html = ExecReg( " </?h2[^>]*> " , html)
         html = ExecReg( " </?h3[^>]*> " , html)
         html = ExecReg( " </?h4[^>]*> " , html)
         html = ExecReg( " </?h5[^>]*> " , html)
         html = ExecReg( " </?h6[^>]*> " , html)
         html = ExecReg( " </?b[^>]*> " , html)
         html = ExecReg( " </?strong[^>]*> " , html)
' 去除样式类class=""
         html = ExecReg( " (<[^>]+) class=[^ |^>]*([^>]*>) " , html)
' 去除样式style=""
         html = ExecReg( " (<[^>]+) style=""[^""]*""([^>]*>) " ,   html)
' 去除XML<?xml>
         html = ExecReg( " </?xml[^>]*> " , html)
' 去除命名空间<o:p></o:p>
         html = ExecReg( " </?[a-z]+:[^>]*> " , html)
' 去除字体<font></font>
         html = ExecReg( " </?font[^>]*> " , html)
' 去除字幕<marquee></marquee>
         html = ExecReg( " </?marquee[^>]*> " , html)
' 去除对象<object><param><embed></object>
         html = ExecReg( " </?object[^>]*> " ,   html)
         html = ExecReg( " </?param[^>]*> " , html)
         html = ExecReg( " </?embed[^>]*> " , html)
         DecodeFilter = html
end function