Allowed characters in rolename

Hi all,

I am working on some role download tooling in excel/vba (a.o. to split one role from a multirole download and create a new uploadable file from that) and sometimes run in to rolenames with characters in them which I can not use as (part of) a filename.

Does anyone know of a list of forbidden (or allowed) characters for role names so I can crosscheck it with a similar list for forbidden filename characters?

Thanks in advance,

Jurjen