note 77444 added to function.eregi

To validate a hostname (found on this page): $domain = "([[:alpha:]][-[:alnum:]]*[[:alnum:]])(\.[[:alpha:]] [-[:alnum:]]*[[:alpha:]])+"; But can't this be simplified to: $domain = "([a-z0-9.-]{1,255})(\.[a-z]{2,4})+"; And get the same results? What's the difference? ---- Server IP: 64.71.164.2 Probable Submitter: 67.182.34.47 ---- Manual Page -- http://www.php.net/manual/en/function.eregi.php Edit -- https://master.php.net/note/edit/77444 Del: integrated -- https://master.php.net/note/delete/77444/integrated Del: useless -- https://master.php.net/note/delete/77444/useless Del: bad code -- https://master.php.net/note/delete/77444/bad+code Del: spam -- https://master.php.net/note/delete/77444/spam Del: non-english -- https://master.php.net/note/delete/77444/non-english Del: in docs -- https://master.php.net/note/delete/77444/in+docs Del: other reasons-- https://master.php.net/note/delete/77444 Reject -- https://master.php.net/note/reject/77444 Search -- https://master.php.net/manage/user-notes.php