/mangaddp administrators worldedit.*

vs

/pex group administrators add worldedit.*


How to create a group:
/pex group <groupName> create

How to add permissions to a group:
/pex group <groupName> add <permission>

How to remove permissions from a group:
/pex group <groupName> remove <permission>

How to add a user to a group:
/pex group <groupName> user add <userName>

How to remove a user from a group:
/pex group <groupName> user remove <userName>