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<?php var_dump(preg_match('/^[0-9]+$/', "123")); var_dump(preg_match('/^[0-9]+$/', "123\n")); var_dump(preg_match('/^[0-9]+$/', "\n123\n")); var_dump(preg_match('/^[0-9]+$/D', "123")); var_dump(preg_match('/^[0-9]+$/D', "123\n")); var_dump(preg_match('/^[0-9]+$/D', "\n123\n")); var_dump(preg_match('/^\d+$/D', "123")); var_dump(preg_match('/^\d+$/D', "123.456")); var_dump(preg_match('/^\d+$/D', "123\n")); var_dump(preg_match('/^\d+$/D', "\n123\n"));

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