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A non-capturing optional subpattern

<?php $html = '<link rel="icon" href="http://www.example.com/icon.gif"/> <link rel="prev" title="Previous" href="http://www.example.com/prev.xml"/> <link rel="next" href="http://www.example.com/next.xml"/>'; preg_match_all('/rel="(?:prev|next)"(?: title="[^"]+?")? href= "([^"]*?)"/', $html, $linkMatches); print '$bothMatches is: '; var_dump($linkMatches); ?>