E. E. Cummings

require 'ee_cummings'

# list your environment variables
EECummings.configure do |c|

  # register an environment variable to require
  c.variable do |var|
  
    # the environment variable name
    var.name = 'API_KEY'
    
    # a regular expression that the value of the
    # variable must match
    var.regex = /[a-zA-Z0-9]+/
  end
  
  # register another varialbe
  c.variable do |var|
    var.name = 'API_SECRET'
    # regex is defaulted to /.*/
  end
end

# to retrieve the values of the environment variables
EECummings.api_secret
EECummings.api_key