From: Logan Capaldo <logancapaldo@...>
Date: 2006-03-03T08:28:38+09:00
Subject: Re: gsub wrapper


On Mar 2, 2006, at 6:09 PM, Hector wrote:

> Help!
>
> How do I get $1, $2, and $3 to get interpolated in the following
> snippet?
>
> string = 'This is a test of the emergency'
> regexp = Regexp.new('(\W)+(\w\w)(\W)+')
> replacement = '$1->$2<-$3'
> user_wants_upcase=FALSE
>
> # Note: All variables above are set by the user of the program, so I
> don't know
> # what they will contain before runtime.
>
> string.gsub!(regexp) {
>   return_value = string # Here, how do I get $1, $2, and $3 to
> interpolate?
>
>   if (user_wants_uppercase)
>     return_value.upcase! || return_value
>   end
>
>   return_value
> }
>
> I want return_value to be -> 'This ->is<- a test ->of<- the emergency'
>
> Note: I know that I can get it to work with the non-block version of
> gsub! but I need to use the block version.
>
> Thanks
>
> Hector
>
> -- 
> Posted via http://www.ruby-forum.com/.
>

assuming I understand your question:

str = "#{$1}->#{$2}<-#{$3}"

Alternatively:

str = "#$1->#$2<-#$3"