require "dhoard_palindrome/version"

class String

  # Returns true for a palindrome, false otherwise.
  def palindrome?
    processed_content == processed_content.reverse
  end

  # Returns the letters in a string
  def letters
  	letter_regex = /[a-zA-Z]/
  	self.chars.select { |c| c.match(letter_regex)}.join
  end

  private

    # Returns content for palindrome testing.
    def processed_content
      scan(/[a-z]/i).join.downcase
    end
end