/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
This Regular Expression can validate an email address
/ -The Start and End of the Regular Expression
^ -We are examining a String
()-A And Group
\. - Escaped "."
?- 0 or 1 of what comes before
*- 1 or more of what comes before
$-String Must End Here
{} - How Many of what is before allowed
\w - Any Letter (A-Z & a-z) or Number (0-9) ot the Underscore (_)
+ - One or more of whatever came before
[]-A Or Group