import re


def validate_CEP(CEP: str) -> bool:
    """Validade CEP.
    Args:
        CEP (str): The CEP string to validate.

    Returns:
        bool: If True, CEP is valid. Otherwise, false.
    """
    pattern = re.compile('^[0-9]{8}$', re.I)
    match = pattern.match(str(CEP))

    return bool(match)