## items Type

`string`

## items Constraints

**pattern**: the string must match the following regular expression: 

```regexp
^[0-9]+:[0-9]+$
```

[try pattern](https://regexr.com/?expression=%5E%5B0-9%5D%2B%3A%5B0-9%5D%2B%24 "try regular expression with regexr.com")
