智商测试要求你完成语言和视觉上的类比，想象纸张折叠和剪切之后的样子，推断数字序列，以及其他类似的任务。
IQ tests ask you to complete verbal and visual analogies, to envision paper after it has been folded and cut, and to deduce numerical sequences, among other similar tasks.
问题就在于此：数字签名依赖于字节级的等价测试，但是可能有两个逻辑上相同但包含不同字节序列的XML文档。
Herein lies the problem: Digital signatures rely on byte-level equivalence, whereas it is possible to have two XML documents that are logically the same, but contain different byte sequences.
regex不会把数字序列分隔为单个数字并编写复杂的代码，而是会测试其有效性。
Rather than split the numeric sequence into individual digits and write complex code, a regex can test for validity.
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