From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-05-23T05:28:22+09:00
Subject: Re: why is "does" missing from this sub!-stitution?

On Fri, May 23, 2003 at 05:23:47AM +0900, Dave Oshel wrote:
> [~/Desktop] dave$ cat foobar.rb ; foobar.rb
> #!/usr/local/bin/ruby
> 
> # get a Stanislaw Lem quote containing underscores and backspaces, then
> # replace the word following the deleted underscores and backspaces
> # with the same word surrounded by emphatic arrow glyphs
> 
> `fortune -m Nillity`.each do |x|
>    x.sub!( /(_+\010+)([a-zA-Z]+)/, "-->#{$2}<--" )
>    print x
> end

The second argument is evaluated only once (think about it), on method
call, when $2 == nil.

use 
   x.sub!( /(_+\010+)([a-zA-Z]+)/ ) { "-->#{$2}<--" }
 

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