def target_filter(filterby, source=None):
    """Processes a target string and resolves it to one or more players
    Args:
        filterby: A string filterby in the form of
                Name: "<playername>" ex: "necavi"
                Userid: "#<userid>" ex: "#5"
                Multi-Filter: "@<filterby>" ex "@me"
        source: A player to consider the source, used for filters such as @me
    Returns:
        A list of players that fit the filterby string
    """
    print("Filtering: " + filterby)
    playerlist = []
    if filterby == "":
        pass
    elif filterby[0] == "@":
        if filterby[1] == "!":
            if source is not None and filterby[2:] == "me":
                source_index = index_from_playerinfo(source)
                for player in PlayerGenerator():
                    index = index_from_playerinfo(player)
                    if index != source_index:
                        playerlist.append(index)
            else:
                playerlist = [x for x in PlayerIter(not_filters=filterby[2:], return_types="index")]
        else:
            if source is not None and filterby[1:] == "me":
                playerlist.append(index_from_playerinfo(source))
            else:
                playerlist = [x for x in PlayerIter(is_filters=filterby[1:], return_types="index")]
    elif filterby[0] == "#":
        userid = filterby[1:]
        if userid.isnumeric():
            try:
                playerlist.append(index_from_userid(int(userid)))
            except ValueError:
                pass
    else:
        for playerinfo in PlayerGenerator():
            filterby = filterby.casefold()
            if filterby in playerinfo.get_name().casefold():
                playerlist.append(index_from_playerinfo(playerinfo))
    return playerlist