JavaScript substring

From a string we can get part of the string by specifying starting and ending position of the substring. This functions is different than substr function. In substr function we used start point and length of the substring required ( not end point ). Let us try with some examples .
my_string= new String("Welcome to");
The output of above function is plus

Note that one blank space is included in the above output at the left side.

Getting domain part of email address

We will use indexOf to get the location of the string inside another string, using this we can find out location of '@' and dot '.' within an email address. Then using these two locations we will collect domain part by using substr function.

Here is the code.

var email="";
var start=email.indexOf('@');
var end=email.indexOf('.');
The output is
If the variable end is omitted, then rest of the string is considered.
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    How can split an email into parts before(userID) and after (Domain) the @ sign, and then validate to see if each of these parts are valid?

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