From: "David A. Black" <dblack@...>
Date: 2009-07-17T09:59:53+09:00
Subject: Re: regexp exclusion search - find matches NOT ending with a string?

Hi --

On Fri, 17 Jul 2009, BrendanC wrote:

> I have the following text in a file:
>
> 1 a1.html
> 2 b.doc
> 3 c.xml
> 4 d.tiff
> 5 e.jpeg
> 6 f.html
> ....
>
> I need a regexp to match lines except those that end with ending in
> ".html" - iow - I want lines 2-5 above.  I believe this may require a
> negative lookbehind match.  I tried the following but Ruby (1.8) gives
> an undefined sequence error :
>
> $(?<!\.html)   # <---- this seems to work with other engines
>
> Before you jump re Ruby the version I also tested this here -
> http://www.rubyxp.com/ and get invalid expression (fyi this tests with
> Ruby 1.9). Any ideas/alternatives?

I would probably do:

   lines.reject {|line| line =~ /html$/ }


David

-- 
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