Be able to capture multiple substrings from a string in a case expression

[godalming123]

I think that it would be useful to be able to capture multiple variables at a time from one value in a case expression, for example:

fn lex_loop(index: Int, full_code: String, keywords: List(Keyword)) -> Result(List(Keyword), CodeError) {
    let code_left = string.drop_start(full_code, index)
    let next_keyword: Result(#(Int, Option(KeywordValue)), String) = case code_left {
        // By default, gleam would try to make each capture as short as possible, so the last capture would be as long as possible
        "\"" <> string_contents <> "\"" <> rest_of_code ->
            Ok(#(string.len(string_contents)+2, Some(StringValue(string_contents))))
        " " <> _ | "\t" <> _ | "\n" <>_ -> Ok(#(1, None))
        "" -> Ok(#(0, None))
        rest_of_code -> Error("Unexpected charecter: " <> string.first(rest_of_code))
    }
    case next_keyword {
        Ok(#(0, None)) -> keywords
        Ok(#(keyword_length, optn_keyword_contents)) -> {
            let new_keywords = case optn_keyword_contents {
                None -> keywords
                Some(keyword_contents) -> 
                    list.append(keywords, [Keyword(char_index: index, contents: keyword_contents)])
            }
            lex_loop(index+keyword_length, full_code, new_keywords)
        }
        Error(error_msg) -> Error(CodeError(char_index: index, msg: error_msg))
    }
}

[lpil]

This would need to be a feature added to Erlang and so the VM before we could have it in Gleam.