From: Caleb Clausen <vikkous@...>
Date: 2008-09-08T23:41:38+09:00
Subject: Re: regular expression match and exclude

On 9/7/08, Peņa, Botp <botp@delmonte-phil.com> wrote:
> irb(main):036:0> re2
> => /galleries.*?([^t][^h][^u][^m][^b]).jpg/
> irb(main):038:0> g.select{|x| x=~re2 }
> => ["galleries/image1.jpg", "galleries/image2.jpg", "galleries/image3.jpg"]

Unfortunately this way will fail to match (for instance) "bomb.jpg".
If you want to go this route, you need to do something like this:
(untested!)

/^galleries.*([^t]humb|[^h]umb|[^u]mb|[^m]b|[^b])\.jpg$/   #bleah

Patrick He wrote:
> /^galleries\/((?!thumb).)+\.jpg$/

Ah, brilliant! But it doesn't quite work. It fails to match
"thumb_foo.jpg", which probably should match here. A simple
modification should fix it, tho:

/^galleries\/((?!thumb\.jpg$).)+\.jpg$/

There. That's a pretty nice pure regexp.