Regular expressions

i have an assignment that i have to read the links in this web page https://www.cs.drexel.edu/~kschmidt/...va/sample.html

but i cant figure out the regular expression that matches all "or any" of them here is my code

Code:

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import java.io.*;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class regextest
{
  public static void main( String[] args )
  {
    String expr = "<a[^>]+href=[\"']?([^'\"> ]+)[\"']?[^>]*>";
    String expr2 = " *(?i)href *= *(\"([^\"]*\")|\'[^\"]*\'|([^'"";
    ArrayList<String> inputs = new ArrayList<String>();
    inputs.add("<a href='../../../index.html'>relative link</a>");
    inputs.add("<a href='mailto:kschmidt+cs265@cs.drexel.edu'>");
    inputs.add("<a href=https://software.drexel.edu>here</a>");
    Pattern p = Pattern.compile(expr2);
    for (String s : inputs) {
      System.out.println("s= " + s);
      Matcher m = p.matcher(s);
      System.out.println(m.group(0));
      System.out.println(m.group(1));
    }
  }
}

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this assignment is due in two hours! gunna fail this class!

What doesn't it match that you think it should?