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

\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

\d+\.\d+\.\d+\.\d+