Running a number of consecutive replacements on the same string

Question

I found this example for substring replacement:

use std::str;
let string = \"orange\";
let new_string = str::replace(string, \"or\", \"str\");

Answer 1

The regex engine can be used to do a single pass with multiple replacements of the string, though I would be surprised if this is actually more performant:

extern crate regex;

use regex::{Captures, Regex};

fn main() {
    let re = Regex::new("(or|e)").unwrap();
    let string = "orange";
    let result = re.replace_all(string, |cap: &Captures| {
        match &cap[0] {
            "or" => "str",
            "e" => "er",
            _ => panic!("We should never get here"),
        }.to_string()
    });
    println!("{}", result);
}