On Mon, 2004-02-02 at 14:15, Jas wrote: > I have tried this but its not working. > > !eregi("^[0-9a-fA-F]{2}\:[0-9a-fA-F]{2}\:[0-9a-fA-F]{2}\:[0-9a-fA-F]{2}\:[0-9a-fA-F]{2}\:[0-9a-fA-F]{2}$",$_POST['mac']) > > so it should match 2 characters 0-9a-fA-F > each block of 2 characters is followed by a : and repreated in 6 > blocks.
That's a long expression, try: !preg_match('/^([0-9a-f]{2}($|:)){6}/i', $_POST['mac']); This pattern finds 6 matches of a number or letter (the /i means case-insensitive) followed by either a ':' or the end of the string. -- Adam Bregenzer [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php