Question

Which one is a lexer Generator?

(a) ANTLR

(b) DRASTAR

(c) FLEX

(d) All of the mentioned

The question was asked in a job interview.

Asked question is from Lexical Analyser topic in portion Finite Automata and Regular Expression of Compiler

Answer 1

Correct answer is (d) All of the mentioned

To elaborate: ANTLR – Can generate lexical analyzers and parsers.

DFASTAR – Generates DFA matrix table-driven lexers in C++.

Flex – variant of the “lex” (C/C++).

Ragel – A state machine and lexer generator with output in C, C++, C#, Objective-C, D, Java, Go and Ruby.