From: Luis Parravicini <lparravi@...>
Date: 2007-05-31T00:16:36+09:00
Subject: Re: Substituting Variables

On 5/30/07, Andrew Stewart <boss@airbladesoftware.com> wrote:
> I am running into difficulties trying to use a variable in a
> substitution.  Here's an example:
>
> var = 'October'
> '30 May 2007'.sub( /(\d+)\s(\w+)\s(\d+)/, '\1 #{var} \3' )
>
> Here I would like to get '30 October 2007'.  The back-references,
> i.e. \1 and \3, only work within single quotation marks.  But the
> interpolation only works within double quotation marks.  What to do?

Use double slashes.

irb(main):001:0> var = 'October'
irb(main):002:0> '30 May 2007'.sub( /(\d+)\s(\w+)\s(\d+)/, "\\1 #{var} \\3" )
=> "30 October 2007"


-- 
Luis Parravicini
http://ktulu.com.ar/blog/