validation.js

function validatePassword() {
    password = document.getElementById('password').value;
    retypePassword = document.getElementById('retypePassword').value;
    phone = document.getElementById('phone').value;


    if (phone.length !== 10) {
        alert("phone number should be of 10 numbers length.");
        return false;
    }

    if (password.length < 8) {
        alert("Password must be at least 8 characters long.");
        return false;
    }

    if (!/[A-Z]/.test(password)) {
        alert("Password must contain at least one capital letter.");
        return false;
    }
    if (!/[!@#$%^&*(),.?":{}|<>0-9]/.test(password)) {
        alert("Password must contain at least one special symbol or integer");
        return false;
    }

    if (password !== retypePassword) {
        alert("Passwords do not match.");
        return false;
    }


    return true;
}