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  1. or download this
     use strict;
    use warnings;
    use Data::Dumper;
    ...
    my $test="[1,2,3]";
    my @var = split(/[\]\[,]/,"[1,2,3]");
    print Dumper \@var;
    
  2. or download this
     $VAR1 = [
              '',
              '1',
              '2',
              '3'
            ];
    
  3. or download this
     use strict;
    use warnings;
    use Data::Dumper;
    ...
    my $empty;
    my ($empty,@var) = split(/[\]\[,]/,"[1,2,3]");
    print Dumper \@var;