<?php $message = '<a href="https://www.domain.nl/internet" target="_blank" title="https://www.domain.nl/internet">https://www.domain.nl/internet</a>'; $message = preg_replace_callback('~\shref=[\'"]\Khttps?://www\.domain\.nl(?:/[^\s"\'<>]*)?~i', function($matches) { return 'https://www.affiliatedomain.com/cread.php?id=1234&affid=12345&clickref=me&p=' . urlencode('[[' . $matches[0] . ']]'); }, $message); echo $message; // =%5B%5Bhttps%3A%2F%2Fwww.domain.nl%2Finternet%5D%5D
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