UUID regex

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

class Main {
    public static void main(String[] args) {
        String[] uuids = {
            "8fff4739-5f85-452d-8955-b0b0ace74bf7",
            "a1234567-1023-4984-9429-029183c02b1",
            "a1234567-1023-4984-9429-029183c02b1f",
            "hello",
            "a8fff4739-5f85-452d-8955-b0b0ace74bf7",
            "8fff4739-5f85-452d-8955-b0b0ace74bf7a"
        };

        Pattern p = Pattern.compile("^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$");
        
        for (String input: uuids) {
            System.out.print(input + " ");
            if (p.matcher(input).matches()) {
                System.out.println("matches");
            } else {
                System.out.println("does not match");
            }
        }
    }
}