过滤HTML标签

  /// <summary>
    /// 过滤字符
    /// </summary>
    /// <param name="html"></param>
    /// <returns></returns>
    public string checkStr(string html)
    {
        System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<script[\s\S]+</script *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex2 = new System.Text.RegularExpressions.Regex(@" href *= *[\s\S]*script *:", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex3 = new System.Text.RegularExpressions.Regex(@" no[\s\S]*=", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex4 = new System.Text.RegularExpressions.Regex(@"<iframe[\s\S]+</iframe *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"<frameset[\s\S]+</frameset *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex6 = new System.Text.RegularExpressions.Regex(@"\<img[^\>]+\>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex7 = new System.Text.RegularExpressions.Regex(@"</p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex8 = new System.Text.RegularExpressions.Regex(@"<p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex9 = new System.Text.RegularExpressions.Regex(@"<[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
         
        // 过滤 <!--  -->
        System.Text.RegularExpressions.Regex regex10 = new System.Text.RegularExpressions.Regex(@"<!--[\s\S]*?-->", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
         // 过滤 <script>...</script>
        System.Text.RegularExpressions.Regex regex11 = new System.Text.RegularExpressions.Regex(@"<[\s]*?script[^>]*?>[\s\S]*?<[\s]*?\/[\s]*?script[\s]*?>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        // 过滤 <style>...</style>
        System.Text.RegularExpressions.Regex regex12 = new System.Text.RegularExpressions.Regex(@"<[\s]*?style[^>]*?>[\s\S]*?<[\s]*?\/[\s]*?style[\s]*?>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        // 过滤事作 匹配如：<img onclick="if(this.width>1000) return false;"/>
        System.Text.RegularExpressions.Regex regex13 = new System.Text.RegularExpressions.Regex(@"<[^>]*?([^>]*?[\s]on[\w]+[\s]*?=[\s]*?([""']?)([^\2]+?)\2)+[^>]*?>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        // 过滤HTML标签
        System.Text.RegularExpressions.Regex regex14 = new System.Text.RegularExpressions.Regex(@"<[\s\S]*?>", System.Text.RegularExpressions.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
        html = regex6.Replace(html, ""); //过滤frameset
        html = regex7.Replace(html, ""); //过滤frameset
        html = regex8.Replace(html, ""); //过滤frameset
        html = regex9.Replace(html, "");

        html = regex10.Replace(html, "");
        html = regex11.Replace(html, "");
        html = regex12.Replace(html, "");
        html = regex13.Replace(html, "");
        html = regex14.Replace(html, "");
        
        html = html.Replace(" ", "");
        html = html.Replace("<>", "");
        html = html.Replace("<strong>", "");
        html = html.Replace("&lt;br&gt;", "");
        html = html.Replace("\r", "");
        html = html.Replace("\n", "");
        html = html.Replace("&lt;p&gt;", "");
        html = html.Replace("&lt;/p&gt;", "");
        html = html.Replace("&lt;BR&gt", "");
        html = html.Replace("&amp;", "");
        html = html.Replace("&lt;P&gt;", "");
        html = html.Replace("&lt;/P&gt;&lt;P&gt;&lt;/P&gt;", "");
        html = html.Replace("&lt;/P&gt;&lt;/P&gt;", "");
        html = html.Replace("/Div;", "");
        html = html.Replace("Div;", "");
        html = html.Replace("/div;", "");
        html = html.Replace("div;", "");
        html = html.Replace("nbsp;", "");
        html = html.Replace("style=&quot;LINE-HEIGHT: 22px;", "");
        html = html.Replace("class=p1", "");
        
        return html;
    }