What does this regexp mean?

Ruby code posted by murphy < Shri
created at 06 Feb 01:29

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  it "allows substitution to interact with other Regexp constructs" do
    str = "foo)|(bar"
    /(#{str})/.should == /(foo)|(bar)/
    
    str = "a"
    /[#{str}-z]/.should == /[a-z]/

    not_compliant_on(:ruby) do
      str = "J"
      re = /\c#{str}/.should == /\cJ/
    end
  end
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