https://digzon.com/product/pdf-lex-a-lexical-analyzer-generator-m-e-lesk/
[PDF] Lex - a lexical analyzer generator M. E Lesk - DIGZON
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https://cuitutorial.com/lexical-analyzer-recognition-of-operators-variables/
Lexical Analyzer Recognition | Operators Variables| Cuitutorial
Nov 11, 2022 - The lexical analyzer breaks these syntaxes into a series of tokens, by removing any whitespace or comments in the source code.
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