how to create a regex for ip addres in java code example

Example 1: java ip regex pattern

String pattern = "([01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])";

Example 2: ip address regex validate

^((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]?)$