As far as I can tell, Text::Balanced deals with single-character delimiters, whereas your delimiter has two. You might have to resort to using a regexp. 
my $extractor;    # Must be a seperate statement.
$extractor = qr/
   \[\[
   (?:
      (?:  (?! \[\[ | \]\] ) .  )+
   |
      (??{ $extractor })
   )+
   \]\]
/x;

my @links = $text =~ /$extractor/g;

[download]

Optimized (I think): 

my $extractor;    # Must be a seperate statement.
$extractor = qr/
   \[\[
   (?> (?:
      (?:
         (?> [^\[\]]+ )
      |
         \[ (?! \[ )
      |
         \] (?! \] )
      )
   |
      (??{ $extractor })
   )+ )
   \]\]
/x;

my @links = $text =~ /$extractor/g;

[download]

Tested.

In reply to Re: Text::Balanced with nested / custom brackets by ikegami
in thread Text::Balanced with nested / custom brackets by Anonymous Monk

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