database/20230125142000_functions.up.sql

BEGIN;

CREATE FUNCTION is_name(value TEXT) RETURNS BOOLEAN LANGUAGE plpgsql
AS $$BEGIN
    RETURN value = btrim(value) AND length(value) > 0;
END$$;

CREATE FUNCTION is_language_code(value VARCHAR) RETURNS BOOLEAN LANGUAGE plpgsql
AS $$BEGIN
    RETURN value ~ '^[a-z]{2}$';
END$$;

COMMIT;