Function is_iso_date 

pub fn is_iso_date(text: &str) -> bool

Check if a string is a valid ISO date (YYYY-MM-DD)

Example

use polyglot_sql::helper::is_iso_date;

assert!(is_iso_date("2023-01-15"));
assert!(!is_iso_date("01-15-2023"));
assert!(!is_iso_date("not a date"));