custom validation rule for IP in form

How about the check() function? http://codeigniter.com/user_guide/librar...te-1-value

PHP Code:

$validation->check($value, 'required'); 


Maybe you can call your validation with something like this:

PHP Code:

if ( ! $validation->check($request->getIPAddress(), 'yourIpValidationRule')) {
    // Throw exception...
} 


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went thru this guide 3-4 times last 48 hours and never give much thought on this.
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