# File lib/rack/mount/utils.rb, line 118
    def normalize_extended_expression(regexp)
      return regexp if (regexp.options & Regexp::EXTENDED) == 0
      source = regexp.source
      source.gsub!(/#.+$/, '')
      source.gsub!(/\s+/, '')
      source.gsub!(/\\\//, '/')
      Regexp.compile(source)
    end