It works correctly with undefined values as well, whereas with warnings turned on, a regular expression match on an undefined value will print a warning.
该函数也会正确地处理未定义的值，尽管在警告打开时，常规表达式在匹配未定义的值时会输出警告信息。
This paraphrases a warning that cellphone manufacturers include in the small print that is often tossed aside when a new phone is purchased.
在消费者购置新机后，常对手机厂商印在不起眼位置的小字警告不以为然。
If the file can't be found or read, AppConfig will print a warning by default but the program will go on.
如果该文件没有找到或者不可读，AppConfig将会默认地打印一个警告信息，程序还是会继续运行。
There are some issues with Xen support: REE is reported to print various (harmless) warning messages when run in Xen.
目前Xen的支持方面还存在一些问题：有报告说REE在Xen中运行时输出了很多(无害的)警告信息。
Without it, or the equivalent -c switch, perl prints a warning about wide data in the print statement (see perldoc perlunicode and perldoc perlrun for details).
如果没有这个调用，或者等效的- c开关，perl就会打印一个打印语句中有宽数据的警告信息(详细信息请参阅perldocperlunicode和perldocperlrun)。
Without it, or the equivalent -c switch, perl prints a warning about wide data in the print statement (see perldoc perlunicode and perldoc perlrun for details).
如果没有这个调用，或者等效的- c开关，perl就会打印一个打印语句中有宽数据的警告信息(详细信息请参阅perldocperlunicode和perldocperlrun)。
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