regular expression to validate email address code example

Example 1: regular expression for email

^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$

Example 2: regex for email

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