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

public class Main {

    public static void main(String[] args) {

        String str[]={
                "test@google.com",
                "test.test@google.com",
                "test.test@google.com.pl",
                "test123@google.com",
                "test_test@google.com",
                "123test.test@google.com",
                "123test.test@google.pl",
                "aaaa_a.a@google.com",
                "!@google.com",
                "aaa_aaaaaa@google.com.pl.pl.pl.pl"
        };

        Pattern p = Pattern.compile("^.*a[a-zA-Z0-9]+([\\._]?[a-zA-Z0-9])*@[A-Za-z0-9]{2,}(\\.[a-z]{2,})+$");
        Matcher m = null;

        for (int i=0; i<str.length; i++){
            System.out.print(str[i] + " : ");
            m = p.matcher(str[i]);
            System.out.println(m.matches());
        }




    }
}