That's needlessly complicated, simply replace the stuff you don't want with nothing (as Anonymous Monk already said): s/\(.*\)//.

The balancing caveat still applies, of course.

Update: thospel is completely correct, my solution above (and Zaxo's) doesn't work for multiple parenthesis in the same string. To fix this (and actually make it recognise balanced parens): 

$_ = "111(22(33)44)55";
1 while s/ \( [^()]* \) //gx;
if (/[()]/) {
  print "unbalanced!!";
} else {
  print;
}

[download]
BTW, I just noticed a small typo in Zaxo's code, it doesn't work as it stands. It should be my $re = qr/.../;.

-- Hofmator

In reply to Re^2: regular expression paranthesis remover by Hofmator
in thread regular expression paranthesis remover by Kanishka

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