Or as an array of arrays:
use strict;
use warnings;
$| = 0;
my $str="A: Gold, Black, Purple, Blue, Red B: Black, Neon Pink, Ne
+on Yellow, Neon Green, Neon Purple, Red, White, Neon Orange, Navy";
my @records;
my @strings = $str =~ m/(\w+:(?:(?!\b\w+:).)*)/g;
push @records, map {[m/(\w+:)/, m/(?<=:|,)\s([^,]*,?)/g]} @strings;
print "@$_\n" for @records;
Prints:
A: Gold, Black, Purple, Blue, Red
B: Black, Neon Pink, Neon Yellow, Neon Green, Neon Purple, Red, White,
+ Neon Orange, Navy
DWIM is Perl's answer to Gödel
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