Simple PREG_REPLACE PHP problem? Why doesnt this work?

I'm trying to get this code to work... it seems as if just ignore's preg_replace line completely...

	$editurl = 'node';
	$find = '/node/';
	$replace = 'Z';
	preg_replace($find, $replace, $editurl);

OUTPUT Should be: Z
But i am getting: node

WHY? .. its driving me crazy..