Note: If you do not enable this conditional compilation flag, you will get the release version of the driver object that will be used in the target environment.
注：如果我们没有启用这个条件编译标志，那么就可以得到一个可以在目标环境中使用的驱动程序对象文件。
2
Unicode character class specifiers, arbitrary code execution inside a pattern, flag toggles, conditional expressions, and many other features were added to the regular expression engine.