# File lib/rack/mount/vendor/regin/regin/group.rb, line 5
    def initialize(expression, options = {})
      @quantifier = @index = @name = nil
      @capture = true
      @expression = expression.dup(options)

      @quantifier = options[:quantifier] if options.key?(:quantifier)
      @lookahead  = options[:lookahead] if options.key?(:lookahead)
      @capture    = options[:capture] if options.key?(:capture)
      @index      = options[:index] if options.key?(:index)
      @name       = options[:name] if options.key?(:name)
    end