how to filter object name by regex

Hello,
could someone help please with trivial query?

Lets have an object:
```
{
  num1: 1,
  num2: 2,
  num3: 3, 
  str1: "a",
  str2: "b"
}
```

I would like to get only those childs starting with "str".
Expected syntax like:
`$./str.*/` doesn't work

I've been searching for some object name matching syntax, but no luck.

Thanks.