From: dblack@...
Date: 2003-05-23T09:22:51+09:00
Subject: Re: why is "does" missing from this sub!-stitution?

Hi --

On Fri, 23 May 2003, Dave Oshel wrote:

> In article <20030522202818.GA24497@student.ei.uni-stuttgart.de>,
>  Mauricio Fern�ndez <batsman.geo@yahoo.com> wrote:
>
> > use
> >    x.sub!( /(_+\010+)([a-zA-Z]+)/ ) { "-->#{$2}<--" }
>
> Maybe so, but this works as expected:
>
> `/sw/bin/fortune -m Nillity`.each { |x|
>    x.sub!( /(_+\010+)([a-zA-Z]+\b)/, "<u>" + '\2' + "</u>" )
>    print x
> }
>
> Maybe it's a bug ... or a feature ... or a bug ... or a bug AND a
> feature ...  ;-)

Here's an interesting illustration of the persistence of $1:

  >> str = "Hello there."
  => "Hello there."
  >> str2 = "A bunch of words."
  => "A bunch of words."
  >> if /(Hello) (there)/.match(str); str2.sub!(/(A)/, $1); end
  => "Hello bunch of words."
  >> str2
  => "Hello bunch of words."
  >> $1
  => "A"


So... it all depends what you want to do.  (I haven't actually thought
of a case where I'd want to do the above, but still :-)


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav