Online PHP editor | refs for msYZM

<?php $html = <<<HTML <img src="docs/relative/url/img.jpg" /> <img src="/docs/relative/url/img.jpg" /> <img src="https://docs/relative/url/img.jpg" /> <img src="http://docs/relative/url/img.jpg" /> HTML; $base = 'https://example.com/'; echo preg_replace( '~ src="(?!http)\K/?~', $base, $html );