Greetings monks!
This is somewhat RE voodoo, and while I'm fair with sed, and a bit grepish. I don't feel confident enough to subject my understandings to the internet at large -- I'm working with form fields that will be in a web page.
That said;
I have built a couple of functions that return either domain information, or IP information. While I could simply use a select form field, or a radio/checkbox. I was hoping to simply consolidate, and use the single text field, and based on the content, direct it to the proper function.
So my conditionals are:
1.) is a valid domain name
2.) is an IP address
So I can imagine that the easiest, perhaps even the most efficient, might be to simply grep against an IP; 
if (!$input) {print $form;
}else{
if $input (d.d.d.d) $input=>$ip;
}else{
if $input (valid.domain.name) $input=>$domain;
}else{
print $form;
}

[download]
I realize the above is quite simplistic. But I'm afraid I really need some help in this area. What would be good logic to grep patterns correctly to arrive at a efficient conditional?

Thank you very much for all your consideration, and my sincere apologies if this seems a stupid question.

--chris

#!/usr/bin/perl -Tw
use perl::always;
my $perl_version = "5.12.5";
print $perl_version;

In reply to How to best filter/direct data based on input structure? by taint

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