in reply to IP to hex translator

Fore. 

$ perl -MSocket -e 'printf(("%02x"x4)."\n",unpack"C4",inet_aton shift)
+' 127.0.0.1
7f000001

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Update: Granted there's no error checking as the OP's, but that's a single regex at worst (and is left as an exercise for the reader . . . :).

The cake is a lie.
The cake is a lie.
The cake is a lie.

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Re^2: IP to hex translator
by lodin (Hermit) on Aug 14, 2008 at 15:12 UTC

    ... and you don't even have to write the pattern yourself. 

    use Regexp::Common 'net';

$ip =~ /^$RE{net}{IPv4}\z/ or die;

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    lodin

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[d/l]

In Section Cool Uses for Perl