regex to validate email domain code example

Example 1: regex for email

^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$
//will validate for:  [email protected] etc

Example 2: regex to verify email

let regex=/^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-z]+)$/;