Here you can find the source of strip()
String.prototype.strip = function(){ return $.trim(this) }
String.prototype.strip = function() { return this.replace(/^\s+|\s+$/g,""); };
String.prototype.strip = function() { return this.replace(/^\s+/, '').replace(/\s+$/, ''); };
String.prototype.strip = function() { return this.replace(/^\s+/,"").replace(/\s+$/,""); };
var DECODE_HTML_CHARACTERS = { 'nbsp': ' ', 'amp': '&', 'quot': '"', 'lt': '<', 'gt': '>' }; String.prototype.strip = function() { var self = this.replace(/<\/?[^>]+(>|$)/g, ''); ...
String.prototype.strip = function() return this.replace(/^\s+/, '').replace(/\s+$/, ''); },
String.prototype.strip = function () { var s = this.valueOf(); s = s.replace(/([\s]+$)/, ''); s = s.replace(/(^[\s]+)/, ''); return s; };
String.prototype.strip = function(){ return this.replace(/(^\s+|\s$)/gi, ''); };