From: Brian Candler <b.candler@...>
Date: 2008-12-11T17:50:47+09:00
Subject: Re: lambda with $1 fails as gsub block

Mike Gold wrote:
> Matz suggested that the MatchData could have been passed to the block
> for convenience, however it looks more like a necessity, as I don't see
> a solution short of rewriting gsub.

Here's a solution:

  def meth(replace)
    ">x".gsub(%r!(\W)x!) { |match| replace[$~] }
  end

  replace = lambda { |match|
    puts "match is #{match.inspect}"
    puts "match[1] is #{match[1].inspect}"
  }

  meth(replace)  # => match[1] is ">"
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