Extract Hyperlinks

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by IntelliJ IDEA.
 * User: LAPD
 * Date: 28.5.2018 г.
 * Time: 10:37 ч.
 */
public class _16ExtractHyperlinks {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);

        String attributeRegex = "<a[\\s\\S]+?>[\\s\\S]*?<\\/a>";
        String urlRegex = "href\\s*=\\s*(\".*?\"|'.*?'|.*?)[\\s>]";

        StringBuilder stringBuilder = new StringBuilder();

        String input;
        while (!"END".equals(input = console.nextLine())) {
            stringBuilder.append(input);
        }

        Pattern pattern = Pattern.compile(attributeRegex);
        Matcher matcher = pattern.matcher(stringBuilder);

        List<String> attributes = new ArrayList<>();

        while (matcher.find()) {
            String attribute = matcher.group();

            if (attribute.contains("href")) {
                String[] test = attribute.split("<");

                if (test.length == 3) {
                    attributes.add(attribute);
                }
            }
        }

         pattern = Pattern.compile(urlRegex);

        List<String> urls = new ArrayList<>();

        for (String attribute : attributes) {
            matcher = pattern.matcher(attribute);

            if (matcher.find()){
                String url = matcher.group(1);

                if (url.startsWith("'")||url.startsWith("\"")){
                    url=url.substring(1,url.length()-1);
                }

                urls.add(url);
            }
        }

        for (String url : urls) {
            System.out.println(url);
        }
    }
}