How to replace content in "{}"?

help
1

let mut str1 = String::from("hello {world}");
let str2 = "rust";

how to replace content in “{}” with str2？

2 
let str2 = "rust";
let str1: String = format!("hello {}", str2);

I might be misinterpreting your question—if you want to do more general find-and-replace of substrings, use str::replace (or one of the related functions) or the regex crate.

4

I think I need to use regex crate.Thanks a lot.

5

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