What is the difference between Flex/Lex and Yacc/Bison?

Question

What is the difference between Flex & Lex and Yacc & Bison. I searched the Internet wildly and I didn\'t find any solid answer.

Can I install pure Lex and Yacc o

Answer 1

Bison is the GNU implementation/extension of Yacc, Flex is the successor of Lex. In either case, it's fine (and recommended) to use bison / flex.