Help: Validate Domain Name by Regular Express

[WalkinRaven <WalkinRaven@xxxxxxxxx>]

PHP 5.3 PCRE

Regular Express to match domain names format according to RFC 1034 - 
DOMAIN NAMES - CONCEPTS AND FACILITIES

/^
(
  [a-z]                 |
  [a-z] (?:[a-z]|[0-9]) |
  [a-z] (?:[a-z]|[0-9]|\-){1,61} (?:[a-z]|[0-9])			) # One label

(?:\.(?1))*+        # More labels
\.?                 # Root domain name
$/iDx

This rule matches only <label> and <label>. but not <label>.<label>...

I don't know what wrong with it.

Thank you.

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