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<?php var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\\\DBAL'));

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