Natively for validate some text or pattern, I use PHP regex. For this case, to validate IP I use this method $pattern_ip = ‘/\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.’. ‘(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.’. ‘(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.’. ‘(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/’; if ( ! preg_match($pattern_ip,$ip)) { $error_status = 1; echo ‘is not valid ip’; } But recently I found an easy way in CodeIgniter, something missing from my eyes, [...]

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