json_regexp

# File actionpack/lib/action_dispatch/routing/inspector.rb, line 35
      def json_regexp
        str = regexp.inspect.
              sub('\A' , '^').
              sub('\Z' , '$').
              sub('\z' , '$').
              sub(/^\// , '').
              sub(/\/[a-z]*$/ , '').
              gsub(/\(\?#.+\)/ , '').
              gsub(/\(\?-\w+:/ , '(').
              gsub(/\s/ , '')
        Regexp.new(str).source
      end