You can also express this slightly more naturally, at the cost of a slightly less efficient regexp:

  if (/^(\d+\.\d+\.(?![0-3]\.)\d+\.\d+)/) {
    print ...
  }

[download]
that is: match two numbers then (as long as the next number isn't in the range 0 .. 3) match two more numbers.

Hugo

In reply to Re: Question about conditional regex capture by hv
in thread Question about conditional regex capture by TASdvlper

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