PHP screen scrape help

Hi,

I need to extract car images from a website to include in another site. I was checking this tutorial and it's kind of working but i am having problems with the regular expression.

Basically i need a regex to search for li class='car' but whenever i include the class name in the regex it returns nothing.

Below is the code i could like to scrape, its the A tag with the IMG inside that i need, everything else can go !

<li class="car">	                
  <a href="#"><img src="http://image" alt="BMW 3 Series"/></a>     
  <span><img src="a.gif" class="icon"/>8</span>    
</li>

My code so far

[PHP]$url = "http://www.url.com";

$raw = file_get_contents($url);

$newlines = array("\t","\n","\r","\x20\x20","\0","\x0B");

$content = str_replace($newlines, "", html_entity_decode($raw));

$start = strpos($content,'<ol"');

$end = strpos($content,'</ol>',$start) + 6;

$table = substr($content,$start,$end-$start);

preg_match_all("|<li class='cars'(.*)</li>|U",$table,$rows);

foreach ($rows[0] as $row){

if ((strpos($row,'<th')===false)){

preg_match_all("|<a(.*)/>|U",$row,$cells);

$number = strip_tags($cells[0][0]);

echo "{Number {$number} <br>\n";

}

}
[/PHP]

Does anyone know what i am doing wrong ?

Thanks in advance