CODE EXAMPLE FOR JAVASCRIPT

using javascript to validation email before next field

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