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From: "J.R." <groups_jr-1@yahoo.com.br>
Newsgroups: comp.lang.javascript
Subject: Re: FAQ Topic - How do I trim whitespace? (2011-10-14)
Date: Thu, 13 Oct 2011 22:09:37 -0300
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On 13/10/2011 20:00, FAQ server wrote:
> -----------------------------------------------------------------------
> FAQ Topic - How do I trim whitespace?
> -----------------------------------------------------------------------
>
> ECMAScript 5 defines `String.prototype.trim`. Where not supported,
> it can be added as a function that uses a regular expression:
>
> if(!String.prototype.trim) {
> String.prototype.trim = function() {
> return String(this).replace(/^\s+|\s+$/g, "");
> };
> }

> The complete comp.lang.javascript FAQ is at
> http://jibbering.com/faq/
>

A few months ago, there was an article at Jibbering,com with a different 
version of this code:

   /** @see http://jibbering.com/faq/#trimString */
   if (typeof String.prototype.trim !== "function") {
     String.prototype.trim = function () {
       // return String(this).replace(/^\s+|\s+$/g, "");
       return this.replace(/^\s+|\s+$/g, "");
     };
   }

I think that is more consistent with ECMA-262 5th ed., 15.5.4.20.

-- 
Joao Rodrigues (J.R.)