eregi filter stopping valid email address, part two

PHP Gurus A while ago on this list I posted a few questions about an eregi filter for email addresses entered into a form. With the help of people on this list, I settled on the following code which has worked fine in the months since I started using it. The code is this: eregi('^[a-zA-Z0-9+_.-]+@[a-zA-Z0-9-]+.[a-zA-Z.]+$', $email) But recently, a person was unable to get their email to pass this eregi test. The email is valid, as they are able to send email to me. It has the following format: xxxxxxxx@xx1.xx-xxx.ne.jp Shouldn't this email pass? I've allowed for hyphens after the @ mark. Is it that there are two many periods? -- Yoroshiku! Dave G ml@autotelic.com