//database parameter set 1
$db['01']['hostname'] = 'localhost';
$db['01']['username'] = 'root';
$db['01']['password'] = '';
$db['01']['database'] = 'multi_01';

//database parameter set 2
$db['02']['hostname'] = 'localhost';
$db['02']['username'] = 'root';
$db['02']['password'] = '';
$db['02']['database'] = 'multi_02';

You can then create database variables for each of the databases that you want to access

//calling database parameter set 1
$this->db01 = $this->load->database('01', true);

//calling database parameter set 2
$this->db02 = $this->load->database('02', true);

And then by using those created variables, you can get data from those databases.
* Note: I am using the active records methods *

//getting all users from database db01
$database_1_results = $this->db01->get('users');

//getting categories with the user id 1 from db02
$uid = 1;
$database_2_results = $this->db02->get_where('cats', array('uid'=>$uid));

TRUE LOVE COMES FROM GOD.

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import com.twmacinta.util.MD5;
public static String md5Encryption(String strInput) {
    MD5 md5 = new MD5();
    md5.Update(strInput);
    return md5.asHex();
}

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public static boolean isValidEmailAddress(String strEmailAddress) {
    String expression = "^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
    CharSequence inputStr = strEmailAddress;
    Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    return matcher.matches();
}