first, you can use '?' instead of '{0,1}'. secondly, that works for me (I'v check this): 
while (<>) {
  print if /^(-?\d+)\s+(-?\d+)/;
  print $_ for ($1..$2);
}

[download]


, Hotshot

In reply to Re: regex negative numbers by hotshot
in thread regex negative numbers by Anonymous Monk

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