Here you can find the source of normalize()
String.prototype.normalize = function(){ return this.replace(/\<[\/a-z \"=]*\>|\n/g,' ').toLowerCase(); }
String.prototype.nominalize = function() { return this.charAt(0).toUpperCase() + this.slice(1); };
String.prototype.normalize = function(){ return this.trim().replace(/\s{2,}/g, ' '); };
String.prototype.normalize = function () { return this.replace(/\W/g, "");
String.prototype.normalize = function(s) { return this.replace(new RegExp(s + "+", "gm"), s); };