From: "jjyr (jy j)" <jjyruby@...>
Date: 2013-02-21T23:23:23+09:00
Subject: [ruby-core:52625] [ruby-trunk - Feature #7883] Add Regex#to_proc


Issue #7883 has been updated by jjyr (jy j).


judofyr (Magnus Holm) wrote:
> > class Regexp
>  >   def to_proc; lambda {|s| self =~ s} end
>  > end
>  
>  A more general case:
>  
>  class Object
>    def to_proc
>      lambda { |other| self === other }
>    end
>  end
>  
>  (Not that I think this is going to be accepted���)

cool!
----------------------------------------
Feature #7883: Add Regex#to_proc
https://bugs.ruby-lang.org/issues/7883#change-36712

Author: rklemme (Robert Klemme)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 1.9.3


Just a small addition to the standard library:

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

With that one can use a Regex 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

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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