From: Edward Faulkner <ef@...>
Date: 2005-10-26T05:02:47+09:00
Subject: Re: Weird thing with "sub" and "rjust"

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On Wed, Oct 26, 2005 at 04:52:02AM +0900, ricpelo@gmail.com wrote:
> But it doesn't works with:
>=20
>   'hello-3.jpg'.sub(/(\d+)/, '\1'.rjust(3, '0'))
>   =3D> "hello-03.jpg"

The rjust is being evaluated before the sub call, so what you've
written is equivalent to this:

'hello-3.jpg'.sub(/(\d+)/, "0\\1")

Use the block form instead:

'hello-3.jpg'.sub(/(\d+)/) { $1.rjust(3, '0')}
=3D> "hello-003.jpg"

regards,
Ed

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