[转]http://tommyhu.cn/csharp-filter-html/

public static string InputText(string text)//过滤html,js,css代码

    {

        text = text.Trim();

        if (string.IsNullOrEmpty(text))

            return string.Empty;

        text = Regex.Replace(text, "[\\s]{2,}", " "); //两个或多个空格替换为一个

        text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); //<br>

        text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " "); //&nbsp;

        text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty); //其它任何标记

        text = text.Replace("'", "''");

        return text;

    }