import static StringUtils.*;

public class Example {
    public static void main(String[] args) {
        String email = "[email protected]";
        System.out.println("Email valid: " + isValidEmail(email));
        
        String input = "hello-world-example";
        System.out.println("Camel case: " + toCamelCase(input));
        
        String text = "This is a very long string that needs truncation";
        System.out.println("Truncated: " + truncate(text, 20, "..."));
        
        String number = "42";
        System.out.println("Padded: " + padLeft(number, 5, '0'));
    }
}