If the following works perfectly:

if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2}|[com|net|org|edu|info])$", $email))
$errors[] = "A \"Valid e-Mail Address\" is required";


Then why doesnt the below work ??

if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2}|[com|net|org|edu|info|ab.ca|on.ca|org.us|co.uk])$", $email))
$errors[] = "A \"Valid e-Mail Address\" is required";