Get a list of numbers from range(s) of number

I have a data frame where one column contains a range (or ranges) of numbers. I would like to turn this into a list of numbers based of the given range.

Example input:

"35-40"

or

"35-43, 45-47"

This should yield:

[1]  35 36 37 38 39 40

and

[1]  35 36 37 38 39 40 41 42 43 45 46 47