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Lexical Analysis and Parsing. 1. Regular Expressions and Scanning. 2. Our First Flex Program. 2. Programs in Plain Flex. 4. Putting Flex and Bison Together. Lex/Flex is a scanner generator for C/C++. ○ It reads pairs of regular expressions and code to create a lexical analyzer. (scanner) written in C/C++. Flex is a scanner generator tool for lexical analysis, which is based on finite Bison is a LALR(1) parser generator tool for syntax analysis, Both Flex and Bison need the definition of tokens! 2. How to forward the stream of token from Flex to Bison? 3. How to share locations between Flex. This manual (10 September 2021) is for GNU Bison (version 3.8.1), the GNU parser gen This is a difference with tools like Flex, for which '|' stands for Flex and bison are tools designed for writers of compilers and interpreters The bison manual is excellent, especially for referencing specific features. y file and the bison program transforms it into an automaton written in C. Lexical analysis – the lexer The typical structure of a .lex file is as follows: %{.Analyse lexicale avec Flex. Analyse syntaxique avec Bison. Association de Flex et Bison. Fabrice Harrouet. ´Ecole Nationale d'Ingénieurs de Brest.