php acting different in envirnments

[foyer]

I have a dev server that is just a local box here, windows os powered by wamp server. Pretty simple setup. Latest versions of Apache and PHP. My live dedicated server, a unix box, is also running Apache 2.2 and PHP 5.

Here is the code I am having trouble with.

if (preg_match("/^\d{5}$/",$number)) {

On my dev server this works, but on the unix box if $number is any one number, or it's 4 numbers, it will still pass it through. Do I have something with my syntax I am missing or is this a server config issue?

[Weedpacket]

No; that should only match five digits. Where does $number come from? I can see it having different values on Windows and Unix machines if it's a file and your reading it doesn't take the platform into account.

I wouldn't waste preg_match() on the job myself; see if

if(strlen($number)==5 && ctype_digit($number)) {

does the same thing on both servers or not.

[foyer]

$number is a US zipcode. And it is input inserted by a user, so this is merly a check.
I didn't think about strlen though thanks, I'll try it out