<?php

$input = file_get_contents("http://codekicker.de/fragen/php-Links-HTML-Dokument-extrahieren-extrahieren-html-dokument-links/1836");

if(preg_match_all("/<a\s[^>]*href=(\"??)([^\" >]*?)\1[^>]*>(.*)<\/a>/siU", $input, $matches, PREG_SET_ORDER)) {

 print_r($matches);

}

?>

Array
(
    [0] => Array
        (
            [0] => <a href="/" title="codekicker.de - .NET C# Java Javascript Exception"><img alt=".NET C# Java Javascript Exception" src="/res/exception-programmieren-fehler-java-csharp-forum-html-logo.png?v=2" title=".NET C# Java Javascript Exception" />
            </a>
            [1] => "
            [2] => /
            [3] => <img alt=".NET C# Java Javascript Exception" src="/res/exception-programmieren-fehler-java-csharp-forum-html-logo.png?v=2" title=".NET C# Java Javascript Exception" />
            
        )

    [1] => Array
        (
            [0] => <a href="#" onclick="document.getElementById('master-topMenu-loginLinkForm').submit();return false;">login</a>
            [1] => "
            [2] => #
            [3] => login
        )

und so weiter und so weiter....