book: use https for urls (#223)

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谭九鼎
2022-02-28 17:00:16 +08:00
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@@ -227,9 +227,9 @@ An suggested solution can be found [here](../../exercises/6).
## Further Readings
1. [Comments from `std::regex`'s author](http://zhihu.com/question/23070203/answer/84248248)
2. [Library document of Regular Expression](http://en.cppreference.com/w/cpp/regex)
1. [Comments from `std::regex`'s author](https://zhihu.com/question/23070203/answer/84248248)
2. [Library document of Regular Expression](https://en.cppreference.com/w/cpp/regex)
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