Python: validate email address

validate_email_address.py

def validate_email(email_address):
    """
    Validate an email address.

    We selected a "simple" validation with has a bias toward
    letting more edge cases through rather than block them.
    We want the feedback.
    
    Returns True if the email is valid. False is not.

    https://stackoverflow.com/questions/8022530/how-to-check-for-valid-email-address
    """

    # simple regext
    # EMAIL_REGEX = re.compile(r"[^@]+@[^@]+\.[^@]+")

    # https://emailregex.com/
    EMAIL_REGEX = re.compile(r"(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])")

    # unencode. value comes in like this: 'jim%40jim.com'
    try:
        e = urllib.parse.unquote(email_address)
    except Exception as e:
        log.debug(f"ERROR decoding email: {email_address}")
        return False

    if not EMAIL_REGEX.fullmatch(e):
        log.debug(f"validating email FAIL: {e}")
        return False
    else:
        log.debug(f"validating email PASS: {e}")
        return True