<?php

$docBody = '
<html>
<head>
    <title>ololo</title>
</head>
<body>
    <ul>
        <li><a href="http://b...content-available-to-author-only...n.name/">Булка</a></li>
        <li><a href="http://o...content-available-to-author-only...z.ru/">Сайт ололоши</a></li>
        <li><a href="http://content-available-to-author-only.com/">Вконтактик</a></li>
        <li><a href=http://y...content-available-to-author-only...e.com/>Тытруба</a></li>
    </ul>
</body>
</html>';
 
 
preg_match_all(
    
    '#<a\shref=\"([^\"]*)\">.*</a>#siU',
    $docBody,
    $matches
);
 

print_r($matches);