s = s.replace(/^\s+|\s+$/g, ''); // trim leading/trailing spaces
s = s.replace(/[-\s]+/g, '-'); // convert spaces to hyphens
s = s.toLowerCase(); // convert to lowercase
s = s.replace(/^\s+|\s+$/g, ''); // trim leading/trailing spaces
s = s.replace(/[-\s]+/g, '-'); // convert spaces to hyphens
s = s.toLowerCase(); // convert to lowercase