Will convert any string into safe slug. (Replaces any invalid characters with hypens, removes 1+ hypens & removes hyphens from the start & end of string)

slugify.js

String.prototype.slugify = function () {
    return this.replace(/\s/g,'-').replace(/[^a-zA-Z0-9\-]/g,'').replace(/[\-]+/g,'-').replace(/\-$/,'').replace(/^\-/,'').toLowerCase();
}