Issue #11808 has been updated by matz (Yukihiro Matsumoto).

Backport set to 2.5: UNKNOWN, 2.6: UNKNOWN
Tracker changed from Feature to Bug

It is a bug. It has been hidden for 10+ years and seems to be very difficult to fix.
It should be fixed in the long run.

Matz.


----------------------------------------
Bug #11808: Different behavior between Enumerable#grep and Array#grep
https://bugs.ruby-lang.org/issues/11808#change-79278

* Author: BenOlive (Ben Olive)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Regex special global variables are available within the block for `Array#grep`, but are nil within the block for `Enumerable#grep`.

Here is an example that explains it better:

~~~ruby
class Test
  include Enumerable
  def each
    return enum_for(:each) unless block_given?
    yield "Hello"
    yield "World"
  end
end

enum = Test.new
array = ["Hello", "World"]

enum.grep(/^(.)/) {$1} # => [nil, nil]
array.grep(/^(.)/) {$1} # => ["H", "W"]
~~~

Tested on 2.0.0, 2.1.5, & 2.2.2



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