[ruby-core:67084] [ruby-trunk - Feature #7883] Add Regex#to_proc

Issue #7883 has been updated by Tsuyoshi Sawada.


If the proposed patch to issue #9602 gets accepted, then that will covert this issue in a  more general way.

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Feature #7883: Add Regex#to_proc
https://bugs.ruby-lang.org/issues/7883#change-50598

* Author: Robert Klemme
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Category: core
* Target version: next minor
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Just a small addition to the standard library:

~~~ruby
class Regexp
  def to_proc; lambda {|s| self =~ s} end
end
~~~

With that one can use a `Regexp` everywhere a `Proc` is used as filtering criteria saving a bit of typing.  While we have `Enumerable#grep` already there may be other cases where you want to do something like

~~~ruby
irb(main):008:0> %w{foo bar baz}.select &/\Ab/
=> ["bar", "baz"]
irb(main):009:0> %w{foo bar baz}.reject &/\Ab/
=> ["foo"]
irb(main):010:0> %w{foo bar baz}.find &/\Ab/
=> "bar"
~~~

Note: line 9 and 10 are not possible with `Enumerable#grep` AFAIK.

I see low risk of breaking something.



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