update-python-libraries: escape vars in regexes

    :returns: List of matches.

    """

    regex = '{}\s+=\s+"(.*)";'.format(attribute)

    regex = '{}\s+=\s+"(.*)";'.format(re.escape(attribute))

    regex = re.compile(regex)

    values = regex.findall(text)

    return values

def _get_line_and_value(attribute, text, value=None):

    """Match attribute in text. Return the line and the value of the attribute."""

    if value is None:

        regex = rf'({attribute}\s+=\s+\"(.*)\";)'

        regex = rf'({re.escape(attribute)}\s+=\s+\"(.*)\";)'

    else:

        regex = rf'({attribute}\s+=\s+\"({value})\";)'

        regex = rf'({re.escape(attribute)}\s+=\s+\"({re.escape(value)})\";)'

    regex = re.compile(regex)

    results = regex.findall(text)

    n = len(results)