Function is_valid_country_code 

pub fn is_valid_country_code(s: &str) -> bool

Validates that a string is a valid 2-character country code.

Country codes must be exactly 2 alphabetic characters (case-insensitive).

Arguments

• s - The string to validate

Returns

true if the string is a valid country code, false otherwise.

Example

use vanguards_rs::node_selection::is_valid_country_code;

assert!(is_valid_country_code("US"));
assert!(is_valid_country_code("de"));
assert!(!is_valid_country_code("USA")); // Too long
assert!(!is_valid_country_code("U1")); // Contains digit