有正则高手吗？ 帮忙解决一下这个问题

Question

现在有一条sql语句select ID as id,Name as name,IP as ip,lat,lon,0 as type from trk.devs_v2 where type=0 union all select id,signalName as name,ip ,lat,lng as lon,99 as type from yc_signal.signal union all想使用正则让最后一个union all去掉 而不是去掉所有的union all想要的结果为select ID as id,Name as name,IP as ip,lat,lon,0 as type from trk.devs_v2 where type=0 union all select id,signalName as name,ip,lat,lng as lon,99 as type from yc_signal.signal有正则大神帮帮忙呗! 万分感谢

Answer 1

let str = "union albdfdfdfunion alaadunion al";
let reg = str.replace(/(union al)$/,'');
console.log(reg)