If there is a modifier with a variable number like ?,+,* you could just repeat it X times. For example if it is ? repeat 1 time, + repeat 2, * repeat 3 etc...

If there is a modifier with a variable number like ?,+,* you could just repeat it X times. For example if it is ? repeat 1 time, + repeat 2, * repeat 3 etc... If it is |, choose the first or choose randomly.