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Flex (lexical analyser generator)
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==Internals== {{main|Lexical analysis}} These programs perform character parsing and tokenizing via the use of a [[deterministic finite automaton]] (DFA). A DFA is a theoretical machine accepting [[regular language]]s. These machines are a subset of the collection of [[Turing machine]]s. DFAs are equivalent to [[read-only right moving Turing machines]]. The syntax is based on the use of [[regular expressions]]. See also [[nondeterministic finite automaton]].
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