/ Published in: PHP
This is a code to match an IP Address from a source.
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/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/ To use this expression follow the code below. //Save the expression in a variable. $correct_ip_format = "/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/"; //some input from a user through a text field or from a server. $user_input = $_REQUEST['ip_address']; //match the two input's and save it in a variable. //Condition goes here. if(ip_match){ echo "Correct IP Address"; } else{ echo "Incorrect IP Address"; }