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性能提升
89行到111行 这一段其实可以把 boolean 判断提到 if let 前面。之前我也是这么写的。因为判断 true 和 false 只需要一个常数时间，而先调用正则识别并捕获特征这样的一个调用会有很大开销。
我的建议是先 if 判断是否还没更新，如果没更新再调用正则捕获特征。这样每次循环最坏情况下只会有一次大开销加N次常数开销，而不是 N 次大开销加一次常数开销。
[feature] unit test
We must add unit test before 0.2.0 release.
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