Function is_proper_date

17_regex/rust/io_regex/src/main.rs:7–12

The recognized date format is YYYY-MM-DD.

(text: &str)

/// The recognized date format is YYYY-MM-DD.
fn is_proper_date(text: &str) -> bool {
    lazy_static! {
        static ref RE: Regex = Regex::new(r"^(\d{4})-(\d{2})-(\d{2})$").unwrap();
    }
    RE.is_match(text)
}

fn main() {
    println!("Type 'quit' to exit.");