Posted by deko on 02/12/07 09:29

>> As I understand it, the characters that make up an Internet domain name can
>> consist of only alpha-numeric characters and a hyphen
>> (http://tools.ietf.org/html/rfc3696)
> ..."Any characters, or combination of bits (as octets), are permitted in DNS
> names. However, there is a preferred form that is required by most
> applications.".....

I just tried registering various domain names with an underscore. The
registrar's system rejected it. While this may not be the best verification, I
have yet to see a valid Internet domain with an underscore or any other
non-alphanumeric character (other than a hyphen).

> '/^https?:\/\/[a-z0-9-]+(\.[a-z0-9-]+)+/i'

Thanks, Rik

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