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有穷⾃自动机<br />
Lex的核心<br />
本质上等价与状态转换图<br />
区别在于:<br />
自动机是识别器,对每个输入串回答yes or no<br />
分为两类<br />
不确定的有穷自动机(Nondeterministic Finite<br />
Automate,NFA)<br />
确定的有穷状态自动机(Deterministic Finite Automate,<br />
DFA)
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