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How to use possessive quantifier regex?

The possessive quantifiers always eat the entire input string, trying once (and only once) for a match. Unlike the greedy quantifiers, possessive quantifiers never back off, even if doing so would allow the overall match to succeed.

package com.javacoderanch.example.util.regex;

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

public class PossessiveQuantifierDemo {
    public static void main(String[] args) {
        String[] regexs = {
        String input = "xxxxxxx";

        for (String r : regexs) {
            Pattern pattern = Pattern.compile(r);
            Matcher matcher = pattern.matcher(input);

            // Find every match and print it
            System.out.format("Regex:  %s %n", r);
            while (matcher.find()) {
                System.out.format("Text "%s" found at %d to %d.%n",
              , matcher.start(),