C# 检查字符串中是否有HTML标签、返回过滤掉所有的HTML标签后的字符串

        /// <summary>
        /// 检查字符串中是否有Html标签
        /// </summary>
        /// <param name="html">Html源码</param>
        /// <returns>存在为True</returns>
        public static bool CheckHtml(string html)
        {
            string filter = "<[\\s\\S]*?>";
            if (Regex.IsMatch(html, filter))
            {
                return true;
            }

            filter = "[<>][\\s\\S]*?";

            if (Regex.IsMatch(html, filter))
            {
                return true;
            }

            return false;
        }

        /// <summary>
        /// 返回过滤掉所有的Html标签后的字符串
        /// </summary>
        /// <param name="html">Html源码</param>
        /// <returns>过滤Html标签后的字符串</returns>
        public static string ClearAllHtml(string html)
        {
            string filter = "<[\\s\\S]*?>";
            if (Regex.IsMatch(html, filter))
            {
                html = Regex.Replace(html, filter, "");
            }

            filter = "[<>][\\s\\S]*?";
            if (Regex.IsMatch(html, filter))
            {
                html = Regex.Replace(html, filter, "");
            }

            return html;
        }