Regexp::Common's $RE{net}{IPv4} and $RE{net}{domain}{-nospace}
Note that 2130706433 is in fact a valid IP address (equal to 127.0.0.1) and that you might just want to try inet_ntoa inet_aton $ip instead. (These can be found in the standard module Socket).
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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<blockquote> <br /> <dd>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
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taken to ensure that their contents do not
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or How to display code and escape characters
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