byte regex fail

main.rs

use regex::bytes::Regex;

fn main() {
    let re = Regex::new(r"^(.*)$").unwrap();
    let line: Vec<u8> = vec![
        46, 45, 191, 87, 110, 176, 108, 158, 46, 45, 191, 87, 110, 176, 108, 158,
    ];
    let s = std::str::from_utf8(&line);
    if s.is_err() {
        println!("Error in converting from utf8:{:?}", s);
    }
    let rcaps = re.captures(&line);
    if rcaps.is_none() {
        println!("Bad regex parsing: '{:?}'", line);
    } else {
        let caps = rcaps.unwrap();
        println!("caps: {:?}", caps);
    }
}

output.txt

Error in converting from utf8:Err(Utf8Error { valid_up_to: 2, error_len: Some(1) })
Bad regex parsing: '[46, 45, 191, 87, 110, 176, 108, 158, 46, 45, 191, 87, 110, 176, 108, 158]'