求一正则表达式部份替换方法

Question

<SPAN style="FONT-FAMILY: 微软雅黑">要查找的字符串</SPAN><SPAN style="FONT-SIZE: 12PX">要查找的字符串</SPAN>结果<SPAN style="FONT-FAMILY: 微软雅黑">{0}</SPAN><SPAN style="FONT-SIZE: 12PX">{0}</SPAN>
        /// <summary>
        /// 移除文字,看只留下Html标记
        /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        public static string RemoveWord(string html)
        {
            string regexstr = @"<SPAN[\s\S]+?>([\s\S]+?)</SPAN>";
            string str = Regex.Replace(html, regexstr, "{0}", RegexOptions.IgnoreCase);
            return str;
        }上面写的有错，强人帮写一个，在线等！

Answer 1

"(?<=<[^<>]*>)([^<>]*)(?=</[^<>]*>)", "{0}"

Answer 2

        /// <summary>
        /// 移除文字,看只留下Html标记
         /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        public static string RemoveWord(string html)
        {
            string regexstr = @"(?<=<SPAN[^>]*>)[^<]*(?=</SPAN>)";
            string str = Regex.Replace(html, regexstr, "{0}", RegexOptions.IgnoreCase);
            return str;
        }