Raw string literals https://doc.rust-lang.org/stable/reference.html#raw-string-l... and raw byte string literals https://doc.rust-lang.org/stable/reference.html#raw-byte-str...

  r"…", r#"…"#, r##"…"##
  br"…", br#"…"#, br##"…"##

you need to count the #s.