From: Brian Candler <lists@...>
Date: 2012-05-01T02:11:23+09:00
Subject: Re: delete character from array

Chris Morris wrote in post #1058975:
> This is a little blunt, but may be what you need:
>
> '123123123123'.scan(/(\w\w)\w/).to_s
> => "12121212"

That doesn't delete every third character in the string though, as a 
couple of simple tests will show:

>> a = "abcd"
=> "abcd"
>> a.scan(/(\w\w)\w/).to_s
=> "ab"

>> a = "the quick brown fox jumps over the lazy dog"
=> "the quick brown fox jumps over the lazy dog"
>> a.scan(/(\w\w)\w/).to_s
=> "thqubrfojuovthlado"

This is closer:

>> a.scan(/(..)./m).to_s
=> "th qic bow fx ums ve te az d"

But you can see it's still not right, as it's lost the final "g".

I think this is right:

>> a.gsub(/(..)./m) { $1 }
=> "th qic bow fx ums ve te az dg"

Here is another way:

>> a.chars.enum_slice(3).map { |x| x[0,2] }.join
=> "th qic bow fx ums ve te az dg"

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