/// Process the config-file argument.
Process the config-file argument.
Process the config - file argument .
fn config_file(&mut self, arg: &str) {
        let re = Regex::new(r"^--config-file=(.*)$")
            .unwrap();
        self.config_file = re.captures(arg)
            .unwrap()
            .at(1)
            .unwrap()
            .to_string();
    }
fn config_file ( & mut self , arg : & str ) { let re = Regex :: new ( r"^--config-file=(.*)$" ) . unwrap ( ) ; self . config_file = re . captures ( arg ) . unwrap ( ) . at ( 1 ) . unwrap ( ) . to_string ( ) ; }
Process the config-file argument.
Process the config - file argument .
&mut self
arg
&str