what is the output lexical analyzer?
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Tokens are defined often by regular expressions, which are understood by a lexical analyzer generator such as lex. The lexical analyzer (generated automatically by a tool like lex, or hand-crafted) reads in a stream of characters, identifies the lexemes in the stream, and categorizes them into tokens.
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Lexical analysis makes a stream of tokens as output, which consists of keywords,separator, identifier ,operator, and literals. I. Lexical Analysis is specified by context-free grammars and implemented by push down automatically.
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