From: Jeremy Bopp <jeremy@...>
Date: 2011-02-03T04:41:50+09:00
Subject: Re: Help with outfile.write(line) unless line =~ search_text

On 2/2/2011 1:08 PM, pat eyler wrote:
> On Wed, Feb 2, 2011 at 11:51 AM, Bob Hatch <roberth@monavie.com> wrote:
>> Rather than having the output write the line unless it equals
>> search_text, I need it to write when it equals search_text. I know that
>> should be easy, but I can't find the syntax.
>>
>> outfile.write(line) unless line =~ search_text
> 
> try if instead of unless
> 
> http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Control_Structures

Using if instead of unless is definitely clearer here, but you can also
negate the match operator by replacing =~ with !~ as follows:

outfile.write(line) unless line !~ search_text

Double negatives are usually unnecessarily hard to understand at a
glance though, so use the if statement instead of unless here.

-Jeremy