It's worth noting that ikegami's code is essentially a derivation of code in perlre for matching balanced parens: 
$re = qr{
         \(
         (?:
            (?> [^()]+ )    # Non-parens without backtracking
          |
            (??{ $re })     # Group with matching parens
          )*
          \)
        }x;

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In reply to Re^2: Text::Balanced with nested / custom brackets by wojtyk
in thread Text::Balanced with nested / custom brackets by Anonymous Monk

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