比较表达式中的不同数据类型。

Comparing Different Data Types within expressions.

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如果会绕过索引，应该对比较表达式的RHS执行类型转换。

If the index is being bypassed, then the RHS of the comparison should be type-cast.

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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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