validators_URL_gopher = re.compile(r'''
        ^(http|https|gopher)://
        (?:[%:\w]*@)?                           # authenticator
        (?P<domain>[a-z0-9][a-z0-9\-]{1,62}\.)* # (sub)domain - alpha followed by 62max chars (63 total)
        (?P<tld>[a-z]{2,})                      # TLD
        (?::[0-9]+)?                            # port

        # files/delims/etc
        (?P<path>/[a-z0-9\-\._~:/\?#\[\]@!%\$&\'\(\)\*\+,;=]*)?
        $
    ''', re.I | re.VERBOSE)

class SaveBookmarkForm(formencode.Schema):
    """ Handle the save bookmark form """
    tbUrl = validators.URL(not_empty=True, url_re=validators_URL_gopher)