Answers for "email validation in javascript on button click same email"

validate email javascript

function validateEmail(email) {
    const re = /^(([^<>()\[\]\\.,;:\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 re.test(String(email).toLowerCase());
}

using javascript to validation email before next field

/^[a-zA-Z0–9.!#$%&’*+\/=?^_`{|}~-]+@[a-zA-Z0–9](?:[a-zA-Z0–9-]{0,61} [a-zA-Z0–9])?(?:\.[a-zA-Z0–9](?:[a-zA-Z0–9-]{0,61}[a-zA-Z0–9])?)*$/