you can match a string by repeatedly taking derivatives for each character. when you’ve consumed the entire input, you check if the resulting regex accepts the empty string (is “nullable”). if yes, the original string matched.
落成文档：在 Tbox 的「文档」模式里用 Ling 把 Review 结论整理成团队可读的评审纪要（问题分级、修改建议、可复制的重构片段、Checklist）。
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However, back sleeping isn’t right for everyone. In particular, it can cause more interference with airflow compared to other sleeping positions, which causes some people to naturally “self-select” against sleeping on their back, according to McCarty.，更多细节参见51吃瓜
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