Avoid using %r since we have less than once '/'

Use %r only for regular expressions matching more than one '/'
character. Refer to issue #16 …
https://github.com/bbatsov/ruby-style-guide#percent-r
Use English name equivalents for Ruby's special variables

The English library (used by simply placing require ‘english’ in your
program) allows you to access Ruby’s special variables using names
expressed in English, rather than symbols. This makes the variables
easier to remember. It is interesting how rarely this library appears
to be used in publicly available code, although the use of the special
variables does tend to be discouraged. Refer to issue #16 and read more
here …
http://www.rubyinside.com/advent2006/11-english.html