roll syntax/features

[lenscas]

because the user needs to be able to create their own stat sheets and thus also combat rolls there need to come a nice syntax to write these rolls.
I would like some ideas on what it needs to be able to do at a minimum and how the syntax to construct these rolls should look.

Of course, you can also suggest to load in an entire programming language though I would like some pointers on how to properly sandbox your suggested language.

[lenscas]

Decided to go with plain lua script.