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<?php $html = <<<'HTML' some content here <a href="/uploads/2014/04/Draft-99990-Details.doc">Draft 99995 Details</a> more text here <a href="/uploads/2014/04/01090-vs-G01010-series.pdf">01095 vs G01015 Series</a> and some final text here HTML; $dom = new DOMDocument; $dom->loadHTML($html, LIBXML_HTML_NODEFDTD | LIBXML_HTML_NOIMPLIED); $replacement = 'FOO'; foreach ($dom->getElementsByTagName('a') as $node) { $href = $node->getAttribute('href'); $node->setAttribute('href', preg_replace('/([a-z])?\d{5}/i', $replacement, $href)); } echo $dom->saveHTML();

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