From: William James <w_a_x_man@...>
Date: 2005-02-13T06:19:59+09:00
Subject: Re: Currency formatting with regexp


Andrew Johnson wrote:
> On Sat, 12 Feb 2005 09:32:49 +0900, Mark Hubbart
<discordantus@gmail.com>
> wrote:
> [snip]
>
> > golf?
> >
> > def commify(num)
> >   num.to_s.reverse.scan(/..?.?/).join(",").reverse
> > end
>
> That one doesn't do well with floats, which was what the poster
> was dealing with.


I think this works properly:

* def commify( n )
*   n.to_s.reverse.gsub(/(\d{3})(?=\d+-?$)/,'\1,').reverse
* end