Email validation using regex

The Email Id such as adam.sandler@findnerd.com is made up of local-part, an @ symbol and then a domain part. Hence, Email Id is of the form : local_part@domain
*TLD = Top Level Domain

1. Some Valid Emails
   1. findnerd@yahoo.com, findnerd-100@yahoo.com, findnerd.100@yahoo.com
   2. findnerd222@mkyong.com, findnerd.100@findnerd .com.au
   3. findnerd@1.com, findnerd@gmail.com.com
   4. findnerd+100@gmail.com, findnerd-100@yahoo-test.com

2. Some Invalid Emails
   1. findnerd must contains @ symbol
   2. findnerd@.com.my tld can not start with dot .
   3. findnerd123@gmail.a .a is not a valid tld, last tld must contains at least two characters
   4. findnerd 123@.com tld can not start with dot .
   5. findnerd 123@.com.com tld can not start with dot .
   6. .findnerd @findnerd .com emails first character can not start with dot .
   7. findnerd()*@gmail.com emails is only allow character, digit, underscore and dash
   8. findnerd@%*.com emails tld is only allow character and digit
   9. findnerd..2002@gmail.com double dots . are not allow
   10. findnerd.@gmail.com emails last character can not end with dot .
   11. findnerd@findnerd@gmail.com double @ is not allow
   12. findnerd@gmail.com.1a -emails tld which has two characters can not contains digit

public class EmailValidator {

    private Pattern pattern;
    private Matcher matcher;

    private static final String EMAIL_PATTERN = 
          "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" 
                    + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

    public EmailValidator() {
        pattern = Pattern.compile(EMAIL_PATTERN);
    }

    /**
     * Validate hex with regular expression
     * 
     * @param email
     *            hex for validation
     * @return true valid hex, false invalid hex
     */
    public boolean validate(final String email) {

        matcher = pattern.matcher(email);
        return matcher.matches();
}
}

And in your Class you can validate the Email like this:

String emailID = findnerd@.gmail.com; // It is a invalid email
EmailValidator emailValidator = new EmailValidator();
if(emailValidator.validate(emailID)){
{
// Email is valid, do something
}
else{
// Email is invalid, do something
}