Help with PHP eregi alnum if statement

I am trying to test the login id entered from a form.
Checking that the contents are upper or lower case alpha or numeric
0-9
plus the special characters - dash and # pound sign

Code:

if(eregi("([[:alnum:]\#\-]+)", $loginid))
{ print("loginid is alnum"); } else { print("loginid is not
alnum"); }



I get the message "loginid is alnum" no matter what I enter to test.

What is wrong with the statement syntax that it don?t work
correctly?

Thanks for your help

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