Extract user accounts from different contexts...

Extractors(:twitter).sanitize("http://twitter.com/#!/programmingshit") # => "programmingshit"
Extractors(:twitter).sanitize("programmingshit") # => "programmingshit"

... and format them back

Extractors(:twitter).format("programmingshit") # => "http://twitter.com/#!/programmingshit"

Add your own extractors

Extractors.add :lookatme do
  username_regexp = '[a-zA-Z0-9_\\-]{3,20}'
  sanitizer [
    %r{^(?:http://)?(?:www\.)?lookatme\.ru/users/(#{username_regexp})},
    %r{^(#{username_regexp})$}
  ]
  formatter 'http://lookatme.ru/users/%s'
end

List of available extractors

• :facebook
• :googleplus
• :gtalk
• :lastfm
• :livejournal
• :lookatme
• :moikrug
• :myspace
• :skype
• :tumblr
• :twitter
• :vkontakte
• :youtube

Credits

The code itself has been extracted from http://github.com/toy/contacts gem.