Description:
------------
I went to check a mail but have some question.

Reproduce code:
---------------
$mail = "foo@gmail.com";

First way
eregi("^[[:alnum:]_-\.]+@[\.[:alnum:]]+\.(com|edu|net|org)(\.[[:lower:]]{2})?$",$mail)

Second way
eregi("^[[:alnum:]_\.-]+@[\.[:alnum:]]+\.(com|edu|net|org)(\.[[:lower:]]{2})?$",$mail)

Expected result:
----------------
First way
return True

Second way
return True

Actual result:
--------------
First way
Warning: eregi() [function.eregi]: REG_ERANGE in C:\foo\foo.php on line

Second way
return True