Remove brackets from ansible json_query - ansible

Question

I'm trying to parse json in ansible and I got the value I need but the output is an array. How can I get just the value?
Example json:
{
"Version": "2015-08-13",
"Accounts": [{
"AccountName": "account1",
"Regions": [{
"RegionName": "region1",
"RegionId": "region1",
"RegionDetails": [{
"id": "id1",
"version": "v1"
}, {
"id": "id2",
"version": "v2"
}]
}]
}, {
"AccountName": "account2",
"Regions": [{
"RegionName": "region1",
"RegionId": "region1",
"RegionDetails": [{
"id": "id1",
"version": "v1"
}, {
"id": "id2",
"version": "v2"
}]
}]
}]
}
Ansible playbook example:
- name: Set Global Vars
hosts: localhost
tasks:
- name: print json file
debug:
msg: "{{ (lookup('file','./example.json') | from_json) | json_query(query) }}"
vars:
query: "Accounts[?AccountName=='account1'][Regions[?RegionName=='region1'].RegionId]"
register: region_id
Ansible output:
TASK [print json file] *********************************************************
ok: [localhost] => {
"msg": [
[
[
"region1"
]
]
]
}
As you can see the value 'region1' is still nested. How can I get just the value out?
Thanks!

Answer 1

Your original data has nested lists: Accounts is a list, each account contains Regions list.
With your JMESPath query you filter lists by some criteria, but result is still a list, because your data may have more then one account with name AccountName=='account1'.
If you are interested only in first found account and first found region of that account, you can modify query as follows:
Accounts[?AccountName=='account1'] | [0].Regions[?RegionName=='region1'] | [0].RegionId