正则表达式过滤（.net）

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Regex re = new Regex("<a[^>]+href=[^>]+>[^<]*</a>");//这个可以过滤掉所有的超链接的内容

Regex re = new Regex("<a.*?>|</a>");//过滤超链接中的<a ....>xxx</a>标签，标签中xxx内容保留

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);

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 = html.Replace(" ", "");

html = html.Replace("</strong>", "");

html = html.Replace("<strong>", "");

return html;

}