Ooops, mess up and double post...sorry.... This is a straight-forward implementation.
Post again if I didn't get it right.... 
#!/usr/bin/perl -w
use strict;

my $tokens = "32,15,4,72,13,28,14";
my @tokens = split (/,/, $tokens);

my $list = "4,13,15";
my @list = split (/,/,$list);
my %list = map {$_ => 1}@list;

my @ordered_nums = grep{$list{$_}}@tokens; 
print "@ordered_nums\n";

__END__
PRINTS:
15 4 13

[download]
Update: I would perhaps replace "list" with "list_order". Matter of choice.

In reply to Re^3: Convert a string into a hash by Marshall
in thread Convert a string into a hash by vitoco

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