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<?php $content = '<a href="https://example.net">Awesome Button</a> <a href="https://example.net?tag=zero">Awesome Button</a> '; $params = 'param1=blue&param2=red'; echo preg_replace_callback("/(?<=href=[\"'])([^\"'?]+)(?:\?([^\"'?]+))?(?=[\"'])/", function($x) use ($params) { return !empty($x[2]) ? $x[1] . '?' . $params . '&' . $x[2] : $x[1] . '?' . $params; }, $content);
Output for git.master, git.master_jit, rfc.property-hooks
<a href="https://example.net?param1=blue&param2=red">Awesome Button</a> <a href="https://example.net?param1=blue&param2=red&tag=zero">Awesome Button</a>

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