INDEXOFARRAY(SPLIT("/f/c","/"),len(SPLIT("/f/c","/")))
从最后一个指定字符截取字符串-https://help.fanruan.com/finereport/doc-view-2364.html
INDEXOFARRAY(REVERSEARRAY(split("https://aaa/bbb/单位.cpt","/")),1)
split里面的换成你的参数
INDEXOFARRAY(REVERSEARRAY(split($$$,"/")),1)
indexofarray(REVERSEARRAY(split("https://help.fanruan.com/finereport/doc-view-2364.html","/")),1)