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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Parse CSS styles and swap background position value
Date: Tue, 03 Feb 2015 12:44:56 +0100
Organization: PointedEars Software (PES)
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Thomas 'PointedEars' Lahn wrote:

> […] Again, *iff* you can make sure that *all* percentages in the matched 
> property values relate to horizontal background-position (which usually is 
> _not_ the case: […]), then you could use
> 
>   … = value.replace(/\b(?:(left)|(right)|(\d+)%)\b/gi,
>     function (match, left, right, percentage) {
>       return (left
>         ? "right"
>         : (right ? "left" : (100 - percentage) + "%")));
                                                        ^
>     });
> 
> But this does not work already in the case of
> 
>   background: url(example1.png) repeat-x right 50%;

Bad example :)  It would work here (after the extra parenthesis was 
removed), but only because of 100 − 50 = 50.

-- 
PointedEars
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