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C# 过滤html标签

2024-07-04 17:33:22   224人阅读

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public static 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);
           System.Text.RegularExpressions.Regex regex10 = new System.Text.RegularExpressions.Regex(@"[\t\n\r\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 = html.Replace(" ", "");
           html = html.Replace(" ", "");
           html = html.Replace("‘", "‘‘");    //转义单引号
           html = html.Replace("</strong>", "");
           html = html.Replace("<strong>", "");
           return html;
       }

　　


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