What is a few good ways to parse tokens with cassv

[Jethro via Digitalmars-d-learn]

I have to parse a cassv in to tokens but want to keep group 
element that use comma's and spaces as as single token:

e.g.,

a /*b, c*/, d

should be split

a
b, c
d

and not

a /*b, c*/
d

or

a
b
c
d