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my $str = "foo:bar:";

...
use Data::Dumper;
print Dumper( [ $a, \@options ] );
print Dumper( [ $b, $c, $d ] );

$VAR1 = [
          'foo',
...
          'bar',
          ''
        ];

my( $a, @options ) = ( "foo", "bar", "" );
my( $b, $c, $d )   = ( "foo", "bar", "" );
...
use Data::Dumper;
print Dumper( [ $a, \@options ] );
print Dumper( [ $b, $c, $d ] );

$VAR1 = [
          'foo',
...
          'bar',
          ''
        ];