var checkRegisterForm = function () {    
    const username = document.getElementById("username").value;
    const usernameRegex = /^[\d\w]{3,10}$/;
    const password = document.getElementById("password").value;
    const confirmPassword = document.getElementById("password-2").value;
    const passwordRegex = /^.{6,20}$/;
    return usernameRegex.test(username) && passwordRegex.test(password) && password === confirmPassword;
};