[VGHN7XDuOXPAzol]

If you wanted to match on characters (`char`s) then you could do this with single quotes (`'+'`)

Or if you wanted to do it on bytes, you could also do this, with (`b'+'`).

Unsure if that would provide a meaningful boost or not

[epage]

Likely, comparing on `char` ('+') would be slower as it requires decoding the `&str` as a `char` which comes with some significant overhead (I've seen 9% on a fairly optimized parser). Ideally, when you grammar is 7-bit ASCII (or any 8-bit UTF-8 values are opaque to your grammar), you instead parse on `&[u8]` and do `u8` comparisons, rather than `char` or `&[u8]`.

[catfacts]

Thanks for all the information you provided. I will read Rust by Example and stop posting in this thread to avoid deviating from the OP. Anyway, perhaps other readers are learning Rust and having the same questions in their minds, so your answers are also welcome for them.

Edited: I will eliminate my catfacts username (changing passsord to a random one), I don't like being downvoted and I know I should not mention it, but things are what they are. Good bye catfacts !.