Does a string contain a single number within a range in rust - https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=837dee8a23be886210a55207672c9659

main.rs

fn contains_single_num_in_range(s: &str, section_index: usize, min: u8, max: u8) -> Option<u8> {
    s.split('/')
        .nth(section_index)?
        .split('-')
        .filter_map(|part| part.parse::<u8>().ok())
        .find(|&num| (min..=max).contains(&num))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_contains_single_num_in_first_section() {
        let input = "lift-8/state/op/report";
        let section_index = 0;
        let min = 1;
        let max = 8;
        assert_eq!(
            contains_single_num_in_range(input, section_index, min, max),
            Some(8)
        );
    }

    #[test]
    fn test_contains_single_num_in_second_section() {
        let input = "lift/state-7/op/report";
        let section_index = 1;
        let min = 1;
        let max = 8;
        assert_eq!(
            contains_single_num_in_range(input, section_index, min, max),
            Some(7)
        );
    }

    #[test]
    fn test_contains_no_num_in_range() {
        let input = "lift-9/state/op/report";
        let section_index = 0;
        let min = 1;
        let max = 8;
        assert_eq!(
            contains_single_num_in_range(input, section_index, min, max),
            None
        );
    }

    #[test]
    fn test_contains_no_num() {
        let input = "lift-/state/op/report";
        let section_index = 0;
        let min = 1;
        let max = 8;
        assert_eq!(
            contains_single_num_in_range(input, section_index, min, max),
            None
        );
    }
}