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Link: http://codepad.org/pIwwK1Z5    [ raw code | output | fork ]

PHP, pasted on Mar 4: 
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<?php 
$html = '<li class="level1 item3 parent">
    <a href="mainlink.html" class="level1 item3 parent">
        <span>
            <span class="title">Main title</span>
            <span class="sub">Subtitle</span>
        </span>
    </a>
    <ul class="level2">
        <li class="level2 item1 first">
            <a href="alink.html" class="level2 item1 first"><span>Title 1</span></a>
        </li>
        <li class="level2 item2">
            <a href="alink.html" class="level2 item2"><span>Title 2</span></a>
        </li>
        <li class="level2 item3">
            <a href="alink.html" class="level2 item3"><span>Title 3</span></a>
        </li>
        <li class="level2 item4 last">
            <a href="alink.html" class="level2 item4 last"><span>Title 4</span></a>
        </li>
    </ul>
</li>
';

$doc = new DomDocument;
$doc->loadHTML($html);

$li = $doc->getElementsByTagName('li')->item(0)->cloneNode(true);

foreach($li->getElementsByTagName('ul') as $ul) {
    $ul->parentNode->removeChild($ul);
}

$span = $li->getElementsByTagName('span')->item(0);
$span->nodeValue = $li->getElementsByTagName('span')->item(1)->nodeValue;
foreach($span->getElementsByTagName('a') as $a) {
    $a->setAttribute('class', 'level2 item1 first');
}

$ul = $doc->getElementsByTagName('ul')->item(0);

$nodes = $ul->getElementsByTagName('a');
$node = $ul->childNodes->item(0);

$i = 2;
foreach($nodes as $n) {
    $n->setAttribute('class', 'level2 item' . $i);
    $i++;
}

$ul->insertBefore($li, $node);

$nodes->item(1)->parentNode->setAttribute('class', 'level2 item1');

echo $doc->saveHTML();


?>


Output: 
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><li class="level1 item3 parent">
    <a href="mainlink.html" class="level1 item3 parent">
        <span>
            <span class="title">Main title</span>
            <span class="sub">Subtitle</span>
        </span>
    </a>
    <ul class="level2">
<li class="level1 item3 parent">
    <a href="mainlink.html" class="level1 item3 parent">
        <span>Main title</span>
    </a>
    </li>
<li class="level2 item1">
            <a href="alink.html" class="level2 item2"><span>Title 1</span></a>
        </li>
        <li class="level2 item2">
            <a href="alink.html" class="level2 item3"><span>Title 2</span></a>
        </li>
        <li class="level2 item3">
            <a href="alink.html" class="level2 item4"><span>Title 3</span></a>
        </li>
        <li class="level2 item4 last">
            <a href="alink.html" class="level2 item5"><span>Title 4</span></a>
        </li>
    </ul>
</li></body></html>


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