Another very useful CPAN package to get to know is Regexp::Common, which is a kitchen sink collection of “canned,” known good regular-expression patterns, including ones for IP-addresses of all kinds. Especially useful when you need to validate the contents of a file, or to “future proof” your logic.
(To fully see what I mean, click on that page, then click on the link to the right of the author’s name in the gray-shadowed line above “Module Version.” This shows you all of the packages that are part of this one. Then, if you search for the string “Regexp::Common,” you’ll see about 150 more equally-large ones.
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