You have a couple of options:
  1. You can do a match on the whole expression, and do the iterative (/g) match if the whole expression matches,
  2. You can accumulate the captures from the iterative match (on edit: using the /c option), and then test against /\G\Z/g before processing your way through them,
  3. You can lookahead the whole rest of the expression (I don't recommend this, because it duplicates a lot of effort compared to method 1). 
# Option 1:
my $item_regex = qr/
 (?:int)\s+(\w+)\s*?\n
 (?:\s*Number\ of\ Flaps:\s(\d+)\s*?\n)?
 (?:\s*IP\sAddress:?\s([\d\.]+)\s*?\n)?
/x;

while (<DATA>) {
  if (/^$item_regex+\Z/) {
    print "$1, $2, $3\n" while (/\G$item_regex/g);
  }
}

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Caution: Contents may have been coded under pressure.

In reply to Re^3: Making regex /g match continuously by Roy Johnson
in thread Making regex /g match continuously by scottb

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