<?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"];
?>

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