Как извлечь HTML-ссылки с регулярным выражением

(?i)]+)>(.+?)

\s*(?i)href\s*=\s*(\"([^"]*\")|'[^']*'|([^'">\s]+));

(       #start of group #1
 ?i     #  all checking are case insensive
)       #end of group #1
]+    #     anything except (">"), at least one character
   )        #  end of group #2
  >      #     follow by ">"
    (.+?)   #   match anything
          #     end with "

\s*            #can start with whitespace
  (?i)             # all checking are case insensive
     href          #  follow by "href" word
        \s*=\s*        #   allows spaces on either side of the equal sign,
              (        #    start of group #1
               "([^"]*")   #      allow string with double quotes enclosed - "string"
               |       #      ..or
               '[^']*'     #        allow string with single quotes enclosed - 'string'
               |           #      ..or
               ([^'">]+)   #      can't contains one single quotes, double quotes ">"
          )        #    end of group #1

package com.example.crawler.core;

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

public class HTMLLinkExtractor {

    private Pattern patternTag, patternLink;
    private Matcher matcherTag, matcherLink;

    private static final String HTML_A_TAG_PATTERN = "(?i)]+)>(.+?)";
    private static final String HTML_A_HREF_TAG_PATTERN =
        "\\s*(?i)href\\s*=\\s*(\"([^\"]*\")|'[^']*'|([^'\">\\s]+))";


    public HTMLLinkExtractor() {
        patternTag = Pattern.compile(HTML_A_TAG_PATTERN);
        patternLink = Pattern.compile(HTML_A_HREF_TAG_PATTERN);
    }

    /**
     * Validate html with regular expression
     *
     * @param html
     *            html content for validation
     * @return Vector links and link text
     */
    public Vector grabHTMLLinks(final String html) {

        Vector result = new Vector();

        matcherTag = patternTag.matcher(html);

        while (matcherTag.find()) {

            String href = matcherTag.group(1); // href
            String linkText = matcherTag.group(2); // link text

            matcherLink = patternLink.matcher(href);

            while (matcherLink.find()) {

                String link = matcherLink.group(1); // link
                HtmlLink obj = new HtmlLink();
                obj.setLink(link);
                obj.setLinkText(linkText);

                result.add(obj);

            }

        }

        return result;

    }

    class HtmlLink {

        String link;
        String linkText;

        HtmlLink(){};

        @Override
        public String toString() {
            return new StringBuffer("Link : ").append(this.link)
            .append(" Link Text : ").append(this.linkText).toString();
        }

        public String getLink() {
            return link;
        }

        public void setLink(String link) {
            this.link = replaceInvalidChar(link);
        }

        public String getLinkText() {
            return linkText;
        }

        public void setLinkText(String linkText) {
            this.linkText = linkText;
        }

        private String replaceInvalidChar(String link){
            link = link.replaceAll("'", "");
            link = link.replaceAll("\"", "");
            return link;
        }

    }
}

package com.example.crawler.core;

import java.util.Vector;

import org.testng.Assert;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import com.example.crawler.core.HTMLLinkExtractor.HtmlLink;

/**
 * HTML link extrator Testing
 *
 * @author example
 *
 */
public class TestHTMLLinkExtractor {

    private HTMLLinkExtractor htmlLinkExtractor;
    String TEST_LINK = "http://www.google.com";

    @BeforeClass
    public void initData() {
        htmlLinkExtractor = new HTMLLinkExtractor();
    }

    @DataProvider
    public Object[][] HTMLContentProvider() {
      return new Object[][] {
        new Object[] { "abc hahaha google" },
        new Object[] { "abc hahaha google" },

        new Object[] { "abc hahaha google , "
        + "abc hahaha google" },

        new Object[] { "abc hahaha google" },
        new Object[] { "abc hahaha google" },
        new Object[] { "abc hahaha google" },
        new Object[] { "abc hahaha google" }, };
    }

    @Test(dataProvider = "HTMLContentProvider")
    public void ValidHTMLLinkTest(String html) {

        Vector links = htmlLinkExtractor.grabHTMLLinks(html);

        //there must have something
        Assert.assertTrue(links.size() != 0);

        for (int i = 0; i < links.size(); i++) {
            HtmlLink htmlLinks = links.get(i);
            //System.out.println(htmlLinks);
            Assert.assertEquals(htmlLinks.getLink(), TEST_LINK);
        }

    }
}

[TestNG] Running:
  /private/var/folders/w8/jxyz5pf51lz7nmqm_hv5z5br0000gn/T/testng-eclipse--530204890/testng-customsuite.xml

PASSED: ValidHTMLLinkTest("abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google , abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google")
PASSED: ValidHTMLLinkTest("abc hahaha google")