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This bit of code is what I like to use to check the validity of an IP address.

This is a variation of one from the the Great Book "Mastering Regular Expressions" by Jeffrey Friedl,
which I highly recommend.

unless ( $ip =~ m/^(?:[1]?\d\d?|2[0-4]\d|25[0-5])\. (?:[1]?\d\d?|2[0-4]\d|25[0-5])\. (?:[1]?\d\d?|2[0-4]\d|25[0-5])\. (?:[1]?\d\d?|2[0-4]\d|25[0-5])$ /x ) { # do something }
This catches everything except for '0.0.0.0' ip's

which you can handle easily by one addtional check to your test routine.

if ( $ip =~ /^0.0.0.0$/ ) { # do something }
Best Regards,
Wonko

In reply to Re: IP Address Sanity by Wonko the sane
in thread IP Address Sanity by Anonymous Monk

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