Wyrażenia regularne vs DOM Document

<?php

header('Content-Type: text/html; charset=UTF-8');
error_reporting(E_ALL ^ E_NOTICE);
require 'benchmark.php';


function regex($text) {

    $pattern = '/<a\shref=["\']([^"]+)["\']/i';
    preg_match_all($pattern, $text, $matches);

    return $matches[1];

}


function domdocument($text) {

    // Create a new DOM Document to hold our webpage structure
    $dom = new DOMDocument();

    // Load the url's contents into the DOM
    @$dom->loadHTML($text);

    // Empty array to hold all links to return
    $links = array();

    //Loop through each <a> tag in the dom and add it to the link array
    foreach ($dom->getElementsByTagName('a') as $link) {
        $links[] = $link->getAttribute('href');
    }

    return $links;

}


function curl_open($url) {

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_FAILONERROR, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)');
    $output = curl_exec($ch);
    curl_close($ch);

    return $output;

}



$subject = curl_open('http://pl.wikipedia.org/wiki/Polska');


$result = array();

$result[1]['reg']   = Benchmark('regex', 1, $subject);
$result[1]['dom']   = Benchmark('domdocument', 1, $subject);

$result[10]['reg']  = Benchmark('regex', 10, $subject);
$result[10]['dom']  = Benchmark('domdocument', 10, $subject);

$result[100]['reg']     = Benchmark('regex', 100, $subject);
$result[100]['dom']     = Benchmark('domdocument', 100, $subject);

$result[1000]['reg']    = Benchmark('regex', 1000, $subject);
$result[1000]['dom']    = Benchmark('domdocument', 1000, $subject);


echo '<pre>';
print_r ($result);
echo '</pre>';



?>