Hjælp til preg_match_all

<?php

function find_link($html, $label) {
    if(preg_match('/href\s*=\s*"([^"]+)"\s*>\s*<div[^>]*label\s*=\s*"' . $label . '"/', $html, $m)) {
        return $m[1];
    } else {
        return null;
    }
}

$html = '<a role="presentation" href="url1"><div role="link" aria-label="link1"></div></a><a role="presentation" href="url2"><div role="link" aria-label="link2"></div></a>';
echo 'link1 = ' . find_link($html, 'link1') . "\r\n";
echo 'link2 = ' . find_link($html, 'link2') . "\r\n";
echo 'link3 = ' . find_link($html, 'link3') . "\r\n";

?>