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Validate an email address using regular expressions

<?php $email = "someone@example.com"; if(eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email)) { echo "Valid email address.";}else { echo "Invalid email address.";} ?>