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  -- h
ttps://master.php.net/note/delete/77444/integrated
Del: useless     -- http
s://master.php.net/note/delete/77444/useless
Del: bad code    -- htt
ps://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     -- http
s://master.php.net/note/delete/77444/in+docs
Del: other reasons-- https://mast
er.php.net/note/delete/77444
Reject      -- https://mast
er.php.net/note/reject/77444
Search      -- https://
master.php.net/manage/user-notes.php

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Note Submitter: Shea Sollars 

----

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?

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