From: Brian Candler <b.candler@...>
Date: 2011-04-08T00:50:48+09:00
Subject: Re: String.gsub with regex and block

Alexey Petrushin wrote in post #991484:
> Probably a stupid question, but is there a way to use :gsub replacement
> without $0 $1 $2 $3 (and without "\0\1\2\3")?

There is also $~ (Regexp.last_match); $1/$2/etc are just a facade.

> I would prefer something like:
>
>     "John Smith".gsub /(.+)\s(.+)/ do |name, family|
>       p [name, family]
>
>       # instead of this
>       p [$1, $2]
>     end

"John Smith".gsub /(.+)\s(.+)/ do
  name, family = $~.captures
  p [name, family]
end

Not pretty, but you can wrap it up in your own method:

class String
  def gsubcap(*arg)
    gsub(*arg) { yield $~.captures }
  end
end

"John Smith".gsubcap /(.+)\s(.+)/ do |name, family|
  p [name, family]
end

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