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Which among the following is not a tool to construct lexical analyzer from a regular expression?

Which among the following is not a tool to construct lexical analyzer from a regular expression? Correct Answer none of the mentioned

Lexical analysis is done using few tools such as lex, flex and jflex. Jflex is a computer program that generates lexical analyzers (also known as lexers or scanners) and works apparently like lex and flex. Lex is commonly used with yacc parser generator.

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What is the output of a lexical analyzer?
What is the output of lexical analyzer?