Thompson Construction ε-NFA for Identifier Regex Example

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The identifier regex [a-zA-Z_][a-zA-Z0-9_]* is compiled into an ε-NFA using Thompson construction, demonstrating explicit ε transitions for concatenation and Kleene star.

この図に含まれるもの

図の背後にある意思決定を読み解く。

Model the initial character class as a single transition from start to first_char

Use a loop state with ε exits to accept and ε loop-back for the star

Keep the accept state final with no outgoing edges

When teaching or implementing Thompson's construction for regex-to-NFA conversion, especially for identifiers with a required first character and optional subsequent characters.

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Thompson ε-NFA for Identifier Regex

図の背後にある意思決定を読み解く。