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Not a regex, but it works fine for decimal encoded IPs.

sub validIP{ use List::Util qw[ reduce ]; $a = $b; $_[0] =~ m[^[\d\.]+$] and 2**32 > reduce{ $a * 256 + ($b < 256 ? $b : 1e99) } reverse split '\.', $_[0] }


Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

In reply to Re: (Golf) Expression for matching numeric IP addresses by BrowserUk
in thread (Golf) Expression for matching numeric IP addresses by trantor

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