Have you considered the Net::IPv4Addr CPAN module?   I've yet to use it myself, but it looks like it might fit your bill.

From README:
Net::IPv4Addr provides functions for parsing IPv4 addresses both in traditional address/netmask format and in the new CIDR format.   There are also methods for calculating the network and broadcast address and also to see check if a given address is in a specific network.

And from POD: 

ipv4_checkip 
    if ($ip = ipv4_checkip($str) ) {
    # Do something
    }
Return the IPv4 address in the string or undef if the input doesn't co
+ntains a valid IPv4 address.

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    cheers,
    Don
    striving for Perl Adept
    (it's pronounced "why-bick")

In reply to Re: IPv4 regex (Net::IPv4Addr) by ybiC
in thread IPv4 regex by ryan

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