Java Regex: Extract Hyperlinks

/*
 * Write a program to extract all hyperlinks (<href=…>) from a given text.
 * The text comes from the console on a variable number of lines and ends with the command "END".
 * Print at the console the href values in the text. The input text is standard HTML code.
 * It may hold many tags and can be formatted in many different forms (with or without whitespace).
 * The <a> elements may have many attributes, not only href.
 * You should extract only the values of the href attributes of all <a> elements.
 * The input will be well formed HTML fragment (all tags and attributes will be correctly closed).
 * Attribute values will never hold tags and hyperlinks, e.g. "<img alt='<a href="hello">' />" is invalid.
 * Commented links are also extracted.
 * The number of input lines will be in the range [1 ... 100].
 * Print at the console the href values in the text, each at a separate line, in the order they come from the input.
 */

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

public class ExtractHyperlinks_Regex {
    public static void main(String[] args) throws IOException {
        StringBuilder htmlText = new StringBuilder();

        BufferedReader reader =
                new BufferedReader(new InputStreamReader(System.in));

        String inputLine = reader.readLine();
        while (!inputLine.equals("END")) {
            htmlText.append(inputLine);
            inputLine = reader.readLine();
        }

        Pattern hyperlinkPatt = Pattern.compile("<a(?:[^>]+?)href\\s*=\\s*(\"|'|\\s?)(.+?)\\1(?=\\s|>)");
        Matcher match = hyperlinkPatt.matcher(htmlText);

        while (match.find()) {
            System.out.println(match.group(2));
        }
    }
}