import re


def is_base64(string: str) -> bool:
    """
    Verifies if `string` is encoded in Base 64.

    Parameters
    ----------
    string: str
        String object to be verified

    Returns
    ----------
    bool
        True, if `string` complies with Base 64 format, False, otherwise
    """

    return re.match("^([A-Za-z0-9+/]{4})+([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$", string) is not None