yq/pkg/yqlib/doc/operators/contains.md

Contains

This returns true if the context contains the passed in parameter, and false otherwise. For arrays, this will return true if the passed in array is contained within the array. For strings, it will return true if the string is a substring.

{% hint style="warning" %}

Note that, just like jq, when checking if an array of strings contains another, this will use contains and not equals to check each string. This means an expression like contains(["cat"]) will return true for an array ["cats"].

See the "Array has a subset array" example below on how to check for a subset.

{% endhint %}

Array contains array

Array is equal or subset of

Given a sample.yml file of:

- foobar
- foobaz
- blarp

then

yq 'contains(["baz", "bar"])' sample.yml

will output

true

Array has a subset array

Subtract the superset array from the subset, if there's anything left, it's not a subset

Given a sample.yml file of:

- foobar
- foobaz
- blarp

then

yq '["baz", "bar"] - . | length == 0' sample.yml

will output

false

Object included in array

Given a sample.yml file of:

"foo": 12
"bar":
  - 1
  - 2
  - "barp": 12
    "blip": 13

then

yq 'contains({"bar": [{"barp": 12}]})' sample.yml

will output

true

Object not included in array

Given a sample.yml file of:

"foo": 12
"bar":
  - 1
  - 2
  - "barp": 12
    "blip": 13

then

yq 'contains({"foo": 12, "bar": [{"barp": 15}]})' sample.yml

will output

false

String contains substring

Given a sample.yml file of:

foobar

then

yq 'contains("bar")' sample.yml

will output

true

String equals string

Given a sample.yml file of:

meow

then

yq 'contains("meow")' sample.yml

will output

true