NetEase Cloud Music Tech Team
Feb 23, 2023 · Fundamentals
Regular Expressions and Finite Automata: Theory, Performance, and Conversion
The article shows how greedy versus lazy regex patterns can differ dramatically in speed, explains that regular expressions are compiled into finite automata, walks through converting regexes to NFAs, transforming them into DFAs, minimizing those DFAs, and illustrates how backtracking and catastrophic backtracking arise, urging developers to grasp automata theory for writing efficient, reliable patterns.
DFANFAThompson algorithm
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