How can I write a B.N.F Grammar for a list of numbers with the following features?

How can I write a B.N.F Grammar for a list of numbers that when the list is empty it shows [] and otherwise it looks like [4.2, 6, 6.4, 7] or [~4.1, 8, 6.7], etc.

https://stackoverflow.com/questions/66701612/how-can-i-write-a-b-n-f-grammar-for-a-list-of-numbers-with-the-following-feature March 19, 2021 at 10:06AM