```ruby
module RedmineGitHosting::Utils
  module Git

    class << self
      def included(receiver)
        receiver.send(:extend, ClassMethods)
      end
    end


    module ClassMethods

      # Parse a reference component.  Three possibilities:
      #
      # 1) refs/type/name
      # 2) name
      #
      # here, name can have many components.

      @@refcomp = "[\\.\\-\\w_\\*]+"

      def refcomp_parse(spec)
        if (refcomp_parse = spec.match(/^(refs\/)?((#{@@refcomp})\/)?(#{@@refcomp}(\/#{@@refcomp})*)$/))
          if refcomp_parse[1]
            # Should be first class.  If no type component, return fail
            if refcomp_parse[3]
              { type: refcomp_parse[3], name: refcomp_parse[4] }
            else
              nil
            end
          elsif refcomp_parse[3]
            { type: nil, name: "#{refcomp_parse[3]}/#{refcomp_parse[4]}" }
          else
            { type: nil, name: refcomp_parse[4] }
          end
        else
          nil
        end
      end

    end

  end
end
```

Replace class variable by a constant
user
```ruby
module RedmineGitHosting::Utils
  module Git

    class << self
      def included(receiver)
        receiver.send(:extend, ClassMethods)
      end
    end


    module ClassMethods

      # Parse a reference component.  Three possibilities:
      #
      # 1) refs/type/name
      # 2) name
      #
      # here, name can have many components.

      REF_COMPONENT_PART = '[\\.\\-\\w_\\*]+'
      REF_COMPONENT_REGEX = /^(refs\/)?((#{REF_COMPONENT_PART})\/)?(#{REF_COMPONENT_PART}(\/#{REF_COMPONENT_PART})*)$/

      def refcomp_parse(spec)
        if (refcomp_parse = spec.match(REF_COMPONENT_REGEX))
          if refcomp_parse[1]
            # Should be first class.  If no type component, return fail
            if refcomp_parse[3]
              { type: refcomp_parse[3], name: refcomp_parse[4] }
            else
              nil
            end
          elsif refcomp_parse[3]
            { type: nil, name: "#{refcomp_parse[3]}/#{refcomp_parse[4]}" }
          else
            { type: nil, name: refcomp_parse[4] }
          end
        else
          nil
        end
      end

    end

  end
end
```
assistant