Input validation

[________]

Hi,
I got a problem with the eregi function - I don't understand it!
I need a function that checks the variable $name. It can only contain letters (a-z and A-Z) and numbers (0-9), and the field must have more than 3 characters, but less than 10.

Can someone help me?

Thanks!

[Mordecai]

Read this tutorial. It describes everything perfectly.

[laserlight]

In your case it is possible to avoid using regex and use ctype functions.

e.g. as a function:

<?php
function checkName($name) {
	$len = strlen($name);
	//set the locale to C so only [a-zA-Z] for alpha
	setlocale(LC_CTYPE, 'C');
	if ($len > 3 && $len < 10 && ctype_alnum($name))
		return true;
	else
		return false;
}
?>

[Wien]

I didn't know that, it's great, and I presume it's really faster that reg exp !