I think it the same as this : https://forums.mirc.com/ubbthreads.php?ubb=showflat&Board=8&Number=201306&Searchpage=1&Main=37291&Words=%24regsubex+var+-s&topic=0&Search=true#Post201306
It has been changed, it could be changed for this too since it's probably the same, mirc call the alias silently.
