PHP preg_Match含义和问题

<?php
if (isset($_GET['id'])) {
$itemid = $_GET['id'];
$search = "$itemid";
$query = ucwords($search);
$string = file_get_contents('http://clubpenguincheatsnow.com/tools/newitemdatabase/items.php');
if($itemid=="")
{
echo "Please fill out the form.";
}
else
{
$string = explode('<br>',$string);
foreach($string as $row)
{
preg_match('/^(D+)s=s(d+)s=s(D+)s=s(d+)/', trim($row), $matches);
if(strstr($matches[1], $query))
{
echo "<a href='http://clubpenguincheatsnow.com/tools/newitemdatabase/info.php?id=$matches[2]'>";
echo $matches[1];
echo "</a><br>";
}
}
if($matches[1]=="")
{
echo "Item does not exist!";
}
}
}
else {
echo "Item does not exist!";
}
?>

Blue = 1 = No = 20

/^(.+)s=s(d+)s=s(D+)s=s(d+)/