Issue #8948 has been updated by jwille (Jens Wille).


=begin
besides regexps being frozen, there might still be a use case for regexp literals that would only be allocated once:

  def r1; /ab/; end; r1.object_id  #=> 70043421664620
  def r2; /ab/; end; r2.object_id  #=> 70043421398060

  def r3; /ab/f; end; r3.object_id  #=> 70043421033140
  def r4; /ab/f; end; r4.object_id  #=> 70043421033140

i think it's in the same vein as #8579 and #8909.
=end

----------------------------------------
Feature #8948: Frozen regex
https://bugs.ruby-lang.org/issues/8948#change-41976

Author: sawa (Tsuyoshi Sawada)
Status: Feedback
Priority: Normal
Assignee: 
Category: 
Target version: 


=begin
I see that frozen string was accepted for Ruby 2.1, and frozen array and hash are proposed in https://bugs.ruby-lang.org/issues/8909. I feel there is even more use case for a frozen regex, i.e., a regex literal that generates a regex only once. It is frequent to have a regex within a frequently repeated portion of code, and generating the same regex each time is a waste of resource. At the moment, we can have a code like:

    class Foo
      RE1 = /pattern1/
      RE2 = /pattern1/
      RE3 = /pattern1/
      def classify
        case self
        when RE1 then 1
        when RE2 then 2
        when RE3 then 3
        else 4
        end
      end
    end

but suppose we have a frozen `Regexp` literal `//f`. Then we can write like:

    class Foo
      def classify
        case self
        when /pattern1/f then 1
        when /pattern1/f then 2
        when /pattern1/f then 3
        else 4
        end
      end
    end

=end


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