import re


def extract_share_id_from_url(public_base_url: str) -> str:
    """
    Extracts the Airtable share id from the provided URL.

    :param public_base_url: The URL where the share id must be extracted from.
    :raises ValueError: If the provided URL doesn't match the publicly shared
        Airtable URL.
    :return: The extracted share id.
    """

    result = re.search(r"https:\/\/airtable.com\/(shr|app)(.*)$", public_base_url)

    if not result:
        raise ValueError(
            f"Please provide a valid shared Airtable URL (e.g. "
            f"https://airtable.com/shrxxxxxxxxxxxxxx)"
        )

    return f"{result.group(1)}{result.group(2)}"