In cases where the result data is a string, the intermediate result is also converted back to the input code page.

如果结果数据是一个字符串，那么中间结果也要转换回输入代码页。

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If string to be searched is found, the result is a number from 1 to the actual length of input string, expressed in the code units that are explicitly specified.

如果找到搜索字符串，则所得结果是一个从1到输入字符串实际长度之间的一个数字，使用显式指定的代码单元来表示。

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