def parse_inventory(inventory_output=None):
    """Parse the inventory text and return udi dict."""
    udi = {
        "name": "",
        "description": "",
        "pid": "",
        "vid": "",
        "sn": ""
    }
    if inventory_output is None:
        return udi

    # find the record with chassis text in name or descr
    capture_next = False
    chassis_udi_text = None
    for line in inventory_output.split('\n'):
        lc_line = line.lower()
        if ('chassis' in lc_line or 'switch system' in lc_line or 'rack' in lc_line) and 'name' in lc_line and 'descr':
            capture_next = True
            chassis_udi_text = line
            continue
        if capture_next:
            inventory_output = chassis_udi_text + "\n" + line
            break
    match = re.search(r"(?i)NAME: (?P<name>.*?),? (?i)DESCR", inventory_output, re.MULTILINE)
    if match:
        udi['name'] = match.group('name').strip('" ,')

    match = re.search(r"(?i)DESCR: (?P<description>.*)", inventory_output, re.MULTILINE)
    if match:
        udi['description'] = match.group('description').strip('" ')

    match = re.search(r"(?i)PID: (?P<pid>.*?),? ", inventory_output, re.MULTILINE)
    if match:
        udi['pid'] = match.group('pid')

    match = re.search(r"(?i)VID: (?P<vid>.*?),? ", inventory_output, re.MULTILINE)
    if match:
        udi['vid'] = match.group('vid')

    match = re.search(r"(?i)SN: (?P<sn>.*)", inventory_output, re.MULTILINE)
    if match:
        udi['sn'] = match.group('sn').strip()
    return udi