On this RFC: https://www.rfc-editor.org/rfc/rfc7616#page-19 at page 19, there's this example of a text encoded in UTF-8:
J U+00E4 s U+00F8 n D o e
4A C3A4 73 C3B8 6E 20 44 6F 65
How do I represent it in a Rust String?
I tried https://mothereff.in/utf-8 and doing J\00E4s\00F8nDoe but it didn't work.
"Jäsøn Doe" should work fine. Rust source files are always UTF-8 encoded and a string literal may contain any Unicode scalar value (that is, any code point except surrogates, which must not be encoded in UTF-8).
If your editor does not support UTF-8 encoding, but supports ASCII, you can use Unicode code point escapes, which are documented in the Rust reference:
A 24-bit code point escape starts with
U+0075(u) and is followed by up to six hex digits surrounded by bracesU+007B({) andU+007D(}). It denotes the Unicode code point equal to the provided hex value.
suggesting the correct syntax should be "J\u{E4}s\u{F8}n Doe".
You can refer to Rust By Example as everything is not covered in rust eBook
(https://doc.rust-lang.org/stable/rust-by-example/std/str.html#literals-and-escapes)
You can use the syntax \u{your_unicode}
let unicode_str = String::from("J\u{00E4}s\u{00F8}nDoe");
println!("{}", unicode_str);