split /:/, $string, 0 is the same as not putting
the ", 0" on the end. It isn't split zero times.
The number on the end is the number of parts to split the
string INTO, not how many TIMES it is split. Thus 1 gets
you one part and 2 gets you qw( a b:c ). The third
number is a constraint on the size of the list created by
split.