Online PHP editor | output for 5ntv2

<?php $html = <<<HTML <p>Some random text <img src="anything.jpg"> text <iframe data-whoops="<img" src="anything.jpg"></iframe></p> HTML; define('DOC_ROOT', 'www.example.com/'); echo "With regex:\n"; echo preg_replace('/<img([^>]*)src=["\']([^"\'\\/][^"\']*)["\']/', '<img\1src="'.DOC_ROOT.'\2"', $html); echo "\n\n---\n\nWith a parser:\n"; $dom = new DOMDocument; $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); foreach ($dom->getElementsByTagName('img') as $img) { $img->setAttribute('src', DOC_ROOT . $img->getAttribute('src')); } echo $dom->saveHTML();