To see if the string ing is present in the file text, use the index function, which returns the location of the first occurrence of ing so that you can use it for further string processing.

若要查看字符串ing是否出现在文件文本中，请使用index函数，该函数返回ing首次出现的位置，这样您就可以使用它来进行进一步的字符串处理。

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To see if the string ing is present in the file text, use the index function, which returns the location of the first occurrence of ing so that you can use it for further string processing.

若要查看字符串ing是否出现在文件文本中，请使用index函数，该函数返回ing首次出现的位置，这样您就可以使用它来进行进一步的字符串处理。

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