处理 $Behind[select top 10 title as tt,filepath,filename from web_userform_web where sortid=259 and charindex(substring('Let's Encrypt免费证书,certbot安装SSL证书',0,charindex(',','Let's Encrypt免费证书,certbot安装SSL证书')),keyword)>0 |10]$ 标签时出现如下错误：'s' 附近有语法错误。