Function capture_numeric_token

src/email.rs:681–689

(line: &str, key: &str)

}

fn capture_numeric_token(line: &str, key: &str) -> Option<String> {
    let marker = format!("{key} ");
    let start = line.find(&marker)? + marker.len();
    let value: String = line[start..]
        .chars()
        .take_while(|ch| ch.is_ascii_digit())
        .collect();
    if value.is_empty() { None } else { Some(value) }
}

fn capture_quoted_token(line: &str, key: &str) -> Option<String> {
    let marker = format!("{key} ");