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From: FAQ server on 5 Jun 2010 19:00
-----------------------------------------------------------------------
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, "");
};
}

Implementations are inconsistent with ` \s `. For example,
some implementations, notably JScript 5.8 and Safari 2, do not match ` \xA0 `
(no-break space), among others.

A more consistent approach would be to create a character class
that defines the characters to trim.

https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/RegExp

http://thinkweb2.com/projects/prototype/whitespace-deviations/

https://developer.mozilla.org/en/Firefox_3.1_for_developers

http://docs.sun.com/source/816-6408-10/regexp.htm

http://msdn.microsoft.com/en-us/library/6wzad2b2%28VS.85%29.aspx

http://groups.google.com/group/comp.lang.javascript/browse_frm/thread/c7010139217600c3/31092c5eb99625d0?#31092c5eb99625d0

http://unicode.org/Public/UNIDATA/PropList.txt


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

--

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From: Dr J R Stockton on 7 Jun 2010 08:11
In comp.lang.javascript message <4c0ad6fc$0$286$14726298(a)news.sunsite.dk
>, Sat, 5 Jun 2010 23:00:03, FAQ server <javascript(a)dotinternet.be>
posted:

>-----------------------------------------------------------------------
>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:

Surely 'trim' is a Method, and therefore "as" should be "with".

>if(!String.prototype.trim) {
>String.prototype.trim = function() {
>return String(this).replace(/^\s+|\s+$/g, "");
>};
>}
>
>Implementations are inconsistent with ` \s `. For example,
>some implementations, notably JScript 5.8 and Safari 2, do not match ` \xA0 `
>(no-break space), among others.

Safari 2 is somewhat /pass�/. Of my browsers, only MS IE 8 (JScript
5.8.22960) fails to see \u00A0 as a space.

Perhaps someone can test a more recent Mobile Safari with
<URL:http://www.merlyn.demon.co.uk/js-valid.HTM#RsT>.

--
(c) John Stockton, nr London UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME.
Web <URL:http://www.merlyn.demon.co.uk/> - FAQish topics, acronyms, & links.
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