import re


def is_valid_email(
    email: str,
) -> bool:
    """
    Check if email is valid.

    Simple regex checking for:
        <nonwhitespace string>@<nonwhitespace string>.<nonwhitespace string>

    :param email: the email address to check
    :return: true if email is valid, false otherwise
    """
    return bool(re.match(r'^\S+@\S+\.\S+', email))