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$regex = '\w159\.230\.([01]?\d\d?|2[0-4]\d|25[0-4])\.([01]?\d\d?|2[0-4
+]\d|25[0-4])';
while (<INFILE>) {
        if (m/$regex/os) {
        print PIXOUT $_;

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 network-object 159.230.xxx.xxx 255.255.224.0
  network-object 159.230.xxx.xxx 255.255.252.0
...
  network-object host 159.230.xxx.xxx
  network-object host 159.230.xxx.xxx
  network-object host 159.230.xxx.xxx