https://www.zabbix.com/documentation/5.0/manual/config/macros/macro_functions?s[]=regsub

documentation is not correct it states that:

 
<macro> - the macro to customize (for example {ITEM.VALUE} or {#LLDMACRO})
 
 
 
however if i use  {

.regsub("(.)pr|oe|on(.)",\1-\2)}
on the tag it doesn't work
 
so either de documentation is unclear or there is something not working