supposedly current unchanging countenance doesn't relapse any information php

i am controlling following code:

<?php
$stock = $_get[s]; //returns batch ticker representation eg goog yhoo
$first = $stock[0];

$url = "http://biz.yahoo.com/research/earncal/".$first."/".$stock.".html";
$data = file_get_contents($url);

$r_header = '/prev. week(.+?)next week/';
$r_date = '/\<b\>(.+?)\<\/b\>/';

preg_match($r_header,$data,$header);
preg_match($r_date, $header[1], $date);

echo $date[1];
?>

i've checked unchanging expressions seem valid. i check only $url $data out justly i imitation $data check source formula i'm looking regex there. you're prying checking anything, an instance repremand url

i've attempted all i cruise of, including both var_dump($header) var_dump($date), both relapse lifeless arrays.

i have means emanate unchanging expressions works. instance, following justly advantage "earnings":

$r_header = '/company (.+?) calendar/';
preg_match($r_header,$data,$header);
echo $header[1];

i am going nuts perplexing figure out since isn't working. any assistance awesome. thanks.