Robert K. wrote in post #989148:
> On Fri, Mar 25, 2011 at 2:58 AM, 7stud -- <bbxx789_05ss / yahoo.com>
> wrote:
>> perl's regexes have a recursive feature, which can solve your problem.
>> Want to call an external script?
>
> Not necessary: Ruby has it, too.
>
> irb(main):002:0> %r{(?<ne> \( (?:\g<ne>|[^()]+)* \) )}x
>

How come the perl regex uses the non-backtracking ++, and yours doesn't 
appear to do the equivalent?

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