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@ 2018-11-26T14:35:56Z

<?php
$html = '<ul class="foo">
  <li>Item 1</li>
  <li>Item 2</li>
  <li>Item 3</li>
</ul>';

$newHtml = preg_replace("/(?<=<li>)(.*)(?=<\/li>)/", '<svg class="icon"><use xlink:href="#foo"></use></svg>$1', $html);

echo $newHtml;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

27.63 ms | 404 KiB | 5 Q