Checking if a string is alphanumeric

Jmz · 08-01-2008, 09:28 AM

I was looking for the best way to check if a string is alphanumeric and I found things along the lines of:

PHP Code:


			
function is_alphanumeric($someString){

return (preg_match("/[\w\s.]/i", $someString) > 0) ? true : false;

}

But then I found the ctype_alnum function for PHP which should I be using?

The second one seems much better to me

delayedinsanity · 08-01-2008, 05:43 PM

Use ctype over preg_match where possible, yes.
-m

Aaron · 08-01-2008, 07:21 PM

THANK YOU

I haven't found that function before... and I hate regex... and I usually cry when I have alphanumeric input fields.

You saved me many hours of crying.