Eregi or Regi?

[podja]

I'm looking to validate the username for my user registration system. I only want to alow certain characters (A-Z,a-z,1-9,_,-). How do I check that the username only contains these characters?

 

I think it is eregi or regi or something similar.

[Hughesy1986]

http://uk2.php.net/eregi

[Lumio]

<?php
$username = 'test5-3_4';
if (preg_match('{^[\w\d-]+$}', $username) )
	echo 'valid';
else
	echo 'invalid';
?>

^ means it has to begin from the first sign on. In my example from t

\w is the same as A-Za-z_

\d is the same as 0-9

$ means it has to be the last sign... so test5-3_4 & is invalid

[neel_basu]

Use \w+