如果它们匹配，用户完全可以认定文件在传输过程中没有被篡改。

If they match, the user can sufficiently assume that the file hasn't been tampered with in transit.

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您可以将数据与正则表达式进行比较，如果它们匹配，则知道数据是有效的。

You can compare data to a regular expression; if they match, you know your data is valid.

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如果它们不匹配，您有两种选择。

If they do not match, you have two options.

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