PositiveLookaheadExample.java Source code

Introduction

Here is the source code for PositiveLookaheadExample.java

Source

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PositiveLookaheadExample {
    public static void main(String args[]) {
        String regex = "(?=^255).*";

        Pattern pattern = Pattern.compile(regex);

        String candidate = "255.0.0.1";

        Matcher matcher = pattern.matcher(candidate);

        String ip = "not found";

        if (matcher.find())
            ip = matcher.group();

        String msg = "ip: " + ip;

        System.out.println(msg);
    }
}