don’t let the complex notation scare you - the core idea is extremely simple. the derivative of a regex R and a character c is simply whatever is left to match after removing the first character.
最后给大伙儿的建议：如果你的项目是 SpringBoot 3.2+、JDK 21+，赶紧试试虚拟线程，先在测试环境压测一把，性能杠杠的！
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