From: Caleb Clausen <vikkous@...>
Date: 2009-11-13T08:24:15+09:00
Subject: Re: DRYing a Regex

On 11/12/09, RichardOnRails
<RichardDummyMailbox58407@uscomputergurus.com> wrote:
> upper = /[A-Z]+/
> not_upper= Regexp.new(  upper.source.sub( /\[/, '[^' )  )
[snip]
> But the not_upper Regexp definition is really a kludge.  It somewhat
> camouflages what is really /[^A-Z]+/
>
> I'd like to DRY it by expressing it as something like !upper.  I need
> something like !~ we use normally with string searches.

This is somewhat better, but still not real obvious:
not_upper=/(?:.(?!#{upper}))+/  #untested, tho

Myself, I'd just write not_upper=/[^A-Z]/.... for something this
short, is it really worth trying all that hard to be DRY?