From: Eric Hodel <drbrain@...7.net>
Date: 2005-10-26T05:00:23+09:00
Subject: Re: Weird thing with "sub" and "rjust"


On Oct 25, 2005, at 12:52 PM, ricpelo@gmail.com wrote:

> I would like to write code which does the following transformations:
>
>   "hello-3.jpg"   => "hello-003.jpg"
>   "hello-42.jpg"  => "hello-042.jpg"
>   "hello-250.jpg" => "hello-250.jpg"
>
> And I tried this:
>
>   string.sub(/(\d+)/, '\1'.rjust(3, '0'))
>
> where "string" is one of the above strings (in the left side of =>).
>
> It works with:
>
>   'hello-42.jpg'.sub(/(\d+)/, '\1'.rjust(3, '0'))
>   => "hello-042.jpg"
>
> But it doesn't works with:
>
>   'hello-3.jpg'.sub(/(\d+)/, '\1'.rjust(3, '0'))
>   => "hello-03.jpg"
>
> And doesn't works with:
>
>   'hello-250.jpg'.sub(/(\d+)/, '\1'.rjust(3, '0'))
>   => "hello-0250.jpg"
>
> What's wrong?

Dunno, but:

.sub(/(\d+)/) { $1.rjust 3, '0' }

seems to do the trick.

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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