<?php
$string = '<p><a href="www.link1.com" class="someClass" title="lorem">Lorem</a> dolor sit amet, consectetur
        adipiscing elit. In iaculis, libero aliquam lacinia feugiat, <a href="www.link2.com" class="someClass" title="Lorem">lorem</a>
        elit congue risus, sed sagittis turpis tortor eget orci. Integer lacinia quis nisi ac aliquet. Sed et convallis diam.</p>';
$xml = simplexml_load_string($string);
//$links= $xml->xpath("//a[contains(text(),'Lorem')]");
$links = $xml->xpath("/a/text()[
  contains(
    translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'),
    'Lorem'
  )
]");

foreach ($links as $link)
    echo $link["href"];
?>