Wildcards such as "*.wikipedia.org" may be used.
Needs at least a top-level domain, for example "*.org".
Supported protocols: http://, https://, ftp://, ftps://, ssh://, sftp://, irc://, ircs://, xmpp:, sip:, sips:, gopher://, telnet://, nntp://, worldwind://, mailto:, tel:, sms:, news:, svn://, git://, mms://, bitcoin:, magnet:, urn:, geo: (defaults to http:// if no protocol is specified).
