I agree with
Your Mother that this is probably not a good idea. If you really need it, here is a way to do it.
C:\Users\Bill\forums\monks>type perl_script.pl
use strict;
use warnings;
use Getopt::Long;
my $temp;
GetOptions("flag:s" => \$temp);
my @flags = split /,/, $temp ;
print join(' ', @flags,), ' ', scalar @flags, " strings\n";
C:\Users\Bill\forums\monks>.\perl_script.pl --flag
0 strings
C:\Users\Bill\forums\monks>.\perl_script.pl --flag a
a 1 strings
C:\Users\Bill\forums\monks>.\perl_script.pl --flag a,b,c
a b c 3 strings
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