Regular Expressions

[bailo81]

im trying to write a regular expression that makes sure that a person registering on my site can only have a username that contains characters of numbers

function checkUsername ($username) {
	if(preg_match("/^[0-1A-Za-z]{6,10}/" , $username)){
	return true; }
	return false; }

then later to call the function

$username = trim($_POST['username']);  

		if(!checkUsername($username)) {  

		$errors['username'] = "please enter a valid username";
		}

i just cant get my head round them!!!

[dewen]

one fix:

"/^[0-1A-Za-z]{6,10}$/"