Fucking Shit Regex

package Regex;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Lab06_ReplaceTag {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String regex = "(^|(?<=\\s))(?<replacedOne><a+) (.+?\\w\\\")(?<replacedTwo>\\>)(\\w+)(?<replacedThree>\\<\\/a\\>)";
        Pattern pattern = Pattern.compile(regex);

        while (true) {
            String input = reader.readLine();
            if ("end".equals(input)) break;

            Matcher matcher = pattern.matcher(input);

            if (!matcher.find()) {
                System.out.println(input);
            } else if (matcher.find()){
                String matchStr = "";
                while (matcher.find()) {
                    matchStr = matcher.group();
                    matchStr = matchStr.replaceAll("<a", "[URL");
                    matchStr = matchStr.replaceAll(">", "]");
                    matchStr = matchStr.replaceAll("</a", "[/URL");

                    System.out.println(matchStr);
                }
            }
        }
    }
}