fn expand_env(str: &str) -> Result<String> {
    lazy_static! {
        static ref RE: Regex = Regex::new(r"%([_\(\)\{\}\[\]\$\\;!\?0-9A-Za-z]+)%").unwrap();
    }
    let mut str_expanded = String::from(str);
    for cap in RE.captures_iter(&*str) {
        let var = &cap[0];
        let clear = var.trim_matches('%');
        let expanded = env::var(clear).chain_err(|| var)?;
        str_expanded = str_expanded.replace(var, &*expanded);
    }

    Ok(str_expanded)
}
// Expand system environment variables, ie. %USERNAME%
Expand system environment variables, ie. %USERNAME%
Expand system environment variables ie . %USERNAME%
fn expand_env(str: &str) -> Result<String> {
    lazy_static! {
        static ref RE: Regex = Regex::new(r"%([_\(\)\{\}\[\]\$\\;!\?0-9A-Za-z]+)%").unwrap();
    }
    let mut str_expanded = String::from(str);
    for cap in RE.captures_iter(&*str) {
        let var = &cap[0];
        let clear = var.trim_matches('%');
        let expanded = env::var(clear).chain_err(|| var)?;
        str_expanded = str_expanded.replace(var, &*expanded);
    }
    Ok(str_expanded)
}
fn expand_env ( str : & str ) -> Result < String > { lazy_static ! { static ref RE Regex Regex new ( r"%([_\(\)\{\}\[\]\$\\;!\?0-9A-Za-z]+)%" ) unwrap ( ) } let mut str_expanded = String :: from ( str ) ; for cap in RE . captures_iter ( & * str ) { let var = & cap [ 0 ] ; let clear = var . trim_matches ( '%' ) ; let expanded = env :: var ( clear ) . chain_err ( | | var ) ? ; str_expanded = str_expanded . replace ( var , & * expanded ) ; } Ok ( str_expanded ) }
Expand system environment variables, ie.
Expand system environment variables ie .
str
&str