Enum describing possible user list string rule item operators.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/user_list_string_rule_item_operator.proto)

| Enums ||
|---|---|
| ## `CONTAINS` | Contains. |
| ## `ENDS_WITH` | Ends with. |
| ## `EQUALS` | Equals. |
| ## `NOT_CONTAINS` | Not contains. |
| ## `NOT_ENDS_WITH` | Not ends with. |
| ## `NOT_EQUALS` | Not equals. |
| ## `NOT_STARTS_WITH` | Not starts with. |
| ## `STARTS_WITH` | Starts with. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |