Function sub

std/re/src/lib.rs:153–155

(pattern: String, repl: String, string: String)

    /* sub: replace every match, expanding backreferences in the template. */
    #[plugin_fn]
    fn sub(pattern: String, repl: String, string: String) -> Result<String> {
        rx(main::sub(&pattern, &repl, &string))
    }

    fn pick(f: &Found, ngroups: usize) -> String {
        if ngroups == 1 { f.groups[0].clone().unwrap_or_default() } else { f.text.clone() }