gistfile1.rb

def self.auto_link_content(content)
    # Splits all HTML tags, except <a></a> tags. Keeps <a></a> tags as whole 
    # so that we don't accidentally link already linked Keywords
    word_groups = content.split(/(<a[^>]*>.+?<\/a>|<\/?[^>]*>|[.]|,|['"]+)/i)
    word_groups.collect! do |words|
      (!words.match(/<\/?[^>]*>|[.]+|,+/) && words.match(/([a-zA-Z]+)/)) ? link_it(words) : words
    end
    word_groups.join
end

def link_it(words)
  # .. 
  # Write your linker here
  # .. 
end