Here you can find the source of rtrim()
// trim whitespaces right String.prototype.rtrim = function() { return this.replace(/\s*$/g,''); }
String.prototype.rTrim = function () { var $whitespace = new String(" \t\n\r"); if ($whitespace.indexOf(this.charAt(this.length - 1)) != -1) { var $i = this.length - 1; while ($i >= 0 && $whitespace.indexOf(this.charAt($i)) != -1) { $i--; return this.substring(0, $i + 1); return new String(this); }; String.prototype.trim = function () { return this.lTrim().rTrim(); };
String.prototype.rTrim = function(charlist) { if (charlist === undefined) charlist = "\s"; return this.replace(new RegExp("[" + charlist + "]+$"), ""); };
String.prototype.rtrim = function() { return this.replace(/\s+$/,""); };
String.prototype.rtrim = function() { return this.replace(/\s+$/ig, ""); String.prototype.ltrim = function() { return this.replace(/^\s+/ig, "");
String.prototype.rtrim = function() { return this.replace(/\s+$/g,"");
String.prototype.rtrim=function() return this.replace(/(\s*$)/g,'');
String.prototype.rtrim = function() { return this.replace(/(\s*$)/g, "");
String.prototype.rtrim = function() { return this.replace(/\s+$/,'');
String.prototype.rtrim = function() return this.replace( /\s*$/g, '' ) ;