Regular Expression for email validation

Unfortunately regular expressions are something I know nothing about.

I am trying to validate an email address using javascript and this is what I am using:

var expression = /^[a-zA-Z0-9]+[a-zA-Z0-9_.-]+[a-zA-Z0-9_-]+@[a-zA-Z0-9]+[a-zA-Z0-9.-]+[a-zA-Z0-9]+.[a-z]{2,4}$/;

However this doesn't allow for someone to use a filter on a gmail address e.g.

[email protected]

Can anyone help me with finding an expression that will allow me to do this?

Thanks.

I have the same problem. Are you looking at it from a framework point of view (say asp.net)?

I'm not quite sure what you mean but I am using this for a client side validation of an email address on a web page using javascript. The server side validation will be the same but using php.

I found this in the VB.NET codebank.

As I said before, I am no expert, however it seems to me that that one still does not allow a plus, and unless I am mistaken it also only allows the address to have 2 sub domains?