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<?php return preg_replace_callback( '/(?<=(&lt;|<)$s(&gt;|>))(.*)(?=(&lt;|<)\/$s(&gt;|>))/i', function($matches){var_dump($matches);die;}, '<tag>stuff</tag>' );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace_callback(): Compilation failed: lookbehind assertion is not fixed length at offset 0 in /in/UDulN on line 3

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