This snippet originally is used for targetting ads banners depended on the geographic location of the visitor, but can be used for other purposes. Also originally is used for US and the rest of the world, but you can add check for other countries too.

Another solution recommends using a text match pattern.
This works, but as long as you've got mail.jar in your classpath anyway, you might as well use this technique instead. (Plus, I think it works with older JDK 1.2+, whereas pattern.compile is 1.4+)

Note that it also accepts a comma-separated list of emails, just like a To: or CC: address line would.

Example of how to use CURL with PHP.

Fixed the regular expression to check for more strict requirements.

A simple search array example.

Format a phone number with php.

I needed to send an email through an authenticated SMTP server. I found the snippet on the PHP website to do the trick.

Convert an irregular name=value pair string into a formatted array.

Generate a random number or string in PHP.

So... this is a simple and great way for validate email address using regular expressions. happy programming!