Need help isolating specific domain name extensions when validating emails

Question

Dear fellow Java developers:
I am trying to write an application in Java using regexp in order to validate a form where a user submits their name, along with their email address. One thing I need to do as part of this application is isolate email addresses with certain extensions. For example, I would like to be able to test to see if a users email address has the top level domain extension ".ca", or has a second level domain extension of the form ".on.ca", ".co.uk", or ".org.uk", etc. Which means that if a user submits an email address that ends in .ca, or .on.ca, the block of code would be able to pick it out by checking against a predetermined regexp, and I would like the regexp to be able to check email addresses that contain a top level extension only(e.g. .ca), or addresses that contain a second level country code extension (e.g. .co.uk).
I tried using the following regexp in my java code, but for some reason, it is not working:
^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.(?:[A-Z]{2}|com|org|net|gov|mil|biz|info|mobil|name|aero|jobs|museum)$
Like the above example, I would like a regexp that would allow me to specify the particular domain extensions that I am looking for ONLY, instead of being a generic one that allows all valid email addresses to pass through.
I have attached my java code that I am using at the moment below. For some reason, when I submit a command line argument of "[email protected]", I am always getting an output of "[email protected] is valid ? false" . Why is that? I can't figure this out, and would appreciate any help on this. I hope this question is clear to everyone.
Thanks in advance to all who reply.
package com.email;
public class Email {
         * @param args
        public static void main(String[] args) {
                // TODO Auto-generated method stub
                if( args.length == 0 ) {
                      System.err.println( "Usage: Email [...]" );
                      System.exit( 99 );
                for( int i = 0; i < args.length; i++ ) {
                        try {
                                System.out.println( args[i] + " is valid ? " + emailVerify( args[i] ));
                        catch( Exception e ) {
                                System.out.println(args[i] + " : " + e.getMessage());
        public static boolean emailVerify(String email){
                String regexp = "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.(?:[A-Za-z]{2}|ca|uk|au)$]";
       if (email != null) {
            return email.matches(regexp);
       } else return false;
}

Answer 1

I wouldn't bother with a regex, but I guess ymmv. I think this is much easier to read and understand:
private final boolean isInValidDomain(final String emailAddress) {
    if (emailAddress.endsWith(".ca")) return true;
    if (emailAddress.endsWith(".on.ca")) return true;
    // etc...
    return false;
}Depending on the number of tests and how often you'll change, you may want to put them in a Database/File and read them into a collection to iterate over.