The upside is less disruptions from my phone which is in line with Cal Newport's suggestions on phone usage. ↩︎
눈보라 속 피어난 타오르는 사랑
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for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).，更多细节参见体育直播
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