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2 definitions found
 for lexer
From The Jargon File (version 4.4.7, 29 Dec 2003) :

   /lek'sr/, n.
      Common hacker shorthand for lexical analyzer, the input-tokenizing stage in
      the parser for a language (the part that breaks it into word-like pieces).
      ?Some C lexers get confused by the old-style compound ops like =-.?

From The Free On-line Dictionary of Computing (18 March 2015) :

  lexical analyser
      (Or "scanner") The initial input stage of a
     language processor (e.g. a compiler), the part that performs
     lexical analysis.

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