<h1>JavaScript Email Validation</h1>
<input name="email" placeholder="Email"/>
<button id="btn" >Validate</button>
<p id="message"></p>

const email = document.querySelector('input[name=email]');
const button = document.querySelector('#btn');
const text =  document.querySelector('#message');

const validateEmail= (email) => {
    var regex = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return regex.test(String(email).toLowerCase());
}

button.addEventListener('click',()=>{
    if(validateEmail(email.value)){
      text.innerText="Valid email";
    }else{
      text.innerText="Invalid email";
    }
})