过滤不安全的HTML代码

　　  Regex regex1 = new Regex(@"<script[\s\s]+</script *>", RegexOptions.IgnoreCase);
        Regex regex2 = new Regex(@" href *= *[\s\s]*script *:", RegexOptions.IgnoreCase);
        Regex regex3 = new Regex(@" on[\s\s]*=", RegexOptions.IgnoreCase);
        Regex regex4 = new Regex(@"<iframe[\s\s]+</iframe *>", RegexOptions.IgnoreCase);
        Regex regex5 = new Regex(@"<frameset[\s\s]+</frameset *>", RegexOptions.IgnoreCase);
        html = regex1.Replace(html, ""); //过滤<script></script>标记
        html = regex2.Replace(html, ""); //过滤href=javascript: (<a>) 属性
        html = regex3.Replace(html, " _disibledevent="); //过滤其它控件的on...事件
        html = regex4.Replace(html, ""); //过滤iframe
        html = regex5.Replace(html, ""); //过滤frameset