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

On most (all?) Linux systems, "Lex" is actually a symbolic link to flex. Basically, it's only a different name to the free version.