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<?php $str=" <b>test</b> <pre> <b>test</b> </pre> <b>test</b> "; echo preg_replace_callback(htmlspecialchars('~(?s)<pre>.*?</pre>~'), function($match) { return htmlspecialchars_decode($match[0]);}, preg_replace('~<(/?)b>~','[$1b]', preg_replace_callback('~(?s)<pre>.*?</pre>~', function($match) { return htmlspecialchars($match[0]);}, $str)));
Output for git.master, git.master_jit, rfc.property-hooks
[b]test[/b] <pre> <b>test</b> </pre> [b]test[/b]

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