How to escape "# and #" in raw string literals

Question

I wanna do this

let mystr = r#"
Id("#1#")
Id("#2#")
Id("#3#")
"#;

Which does not compile, since I need to somehow escape the "# and the #" occurences. but I don't know how to...

Answer 1

So, the problem with your approach is that your raw string contains sequence that is used for terminating raw string. What you need to do is add another # on start and end of raw string. Like this:

let mystr = r##"
Id("#1#")
Id("#2#")
Id("#3#")
"##;

Notice second opening and closing #.
Output is:

Id("#1#")
Id("#2#")
Id("#3#")

You can check it out here on playground.

Check out docs, especially this part:

Raw string literals do not process any escapes. They start with the character U+0072 (r), followed by fewer than 256 of the character U+0023 (#) and a U+0022 (double-quote) character. The raw string body can contain any sequence of Unicode characters and is terminated only by another U+0022 (double-quote) character, followed by the same number of U+0023 (#) characters that preceded the opening U+0022 (double-quote) character.

Answer 2

You can use an arbitrary number of hashes as string delimiters, as long as this number of hashes don't appear in the string itself. Like this:

let mystr = r##"
    Id("#1#")
    Id("#2#")
    Id("#3#")
"##;