def is_conn_col(x: str) -> bool:
    """
    checks whether the given column name corresponds to the format of the
    connectivity data columns, i.e. "1_245", which refers to the connectivity
    between region 1 and region 245

    Examples:
    >>> test_names = ["1_2", "asf", "as_asd"]
    >>> print([is_conn_col(x) for x in test_names])
    Args:
        x: the provided column name

    Returns:
        True if the column corresponds to the connectivity data format
    """
    spl = x.split("_")
    if len(spl) < 2:
        return False
    else:
        try:
            res = (isinstance(int(spl[0]), int) and
                   isinstance(int(spl[1]), int))
        except:
            res = False
        if res:
            return True
        return False