RegEx for split a string with comma ignoring comma with a space

I need to write a regular expression to split a string with comma but not comma with space.I wrote one , but it did not work out.

E.g:

String testString = "CONGO, THE DEMOCRATIC REPUBLIC OF THE,IRAN, ISLAMIC REPUBLIC OF,KOREA, DEMOCRATIC PEOPLE S REPUBLIC OF,NEPAL,NEW ZEALAND,SRI LANKA";

Expected Result:

1. CONGO, THE DEMOCRATIC REPUBLIC OF THE
2. IRAN, ISLAMIC REPUBLIC OF
3. KOREA, DEMOCRATIC PEOPLE S REPUBLIC OF
4. NEPAL
5. NEW ZEALAND
6. SRI LANKA

My code:

public class TestRegEx {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String testString = "CONGO, THE DEMOCRATIC REPUBLIC OF THE,IRAN, ISLAMIC REPUBLIC OF,KOREA, DEMOCRATIC PEOPLE S REPUBLIC OF,NEPAL,NEW ZEALAND,SRI LANKA";
        String[] output = testString.split("([,][^(,\\s)])+");
        for (String country : output) {
            System.out.println(country);
        }
    }
}

OUTPUT:

1. CONGO, THE DEMOCRATIC REPUBLIC OF THE
2. RAN, ISLAMIC REPUBLIC OF
3. OREA, DEMOCRATIC PEOPLE S REPUBLIC OF
4. EPAL
5. EW ZEALAND
6. RI LANKA