def user_filter(config, message, fasnick=None, *args, **kw):
    """ A particular user

    Use this rule to include messages that are associated with a
    specific user.
    """

    fasnick = kw.get('fasnick', fasnick)
    if fasnick:
        return fasnick in fmn.rules.utils.msg2usernames(message, **config)
A particular user

    Use this rule to include messages that are associated with a
    specific user.