singularize

The reverse of pluralize, returns the singular form of a word in a string.

Examples:

  "posts".singularize            # => "post"
  "octopi".singularize           # => "octopus"
  "sheep".singluarize            # => "sheep"
  "word".singluarize             # => "word"
  "the blue mailmen".singularize # => "the blue mailman"
  "CamelOctopi".singularize      # => "CamelOctopus"