[markus_zhang]

Thanks, can you please lemme know which part uses pattern matching? I'd assume mostly in the lexer, but the parser should just be something that consume the tokens and spit out AST. Unless of course it combines the two.

[shawn_w]

Presumably anything that walks the syntax tree.

[markus_zhang]

Thanks. At first I thought it is something like regex, but then I found it's something in functional programming. I need to read a few chapters of the book before buying it because I'm not interested in learning FP at the moment.