Constant LANGUAGE_CODE_PATTERN 

pub const LANGUAGE_CODE_PATTERN: &str = r"^[a-z]{2}-[A-Z]{2}$";

Regular expression pattern for validating language codes.

Examples

use html_generator::constants::LANGUAGE_CODE_PATTERN;
use regex::Regex;

let re = Regex::new(LANGUAGE_CODE_PATTERN).unwrap();
assert!(re.is_match("en-GB"));