Ansible の selectattr で正規表現を使う

match.yml

- hosts: localhost
  gather_facts: false

  vars:
    targets:
      - instance_id: 1
        instance_type: r4.large
      - instance_id: 2
        instance_type: r5.large

  tasks:
    - name: list match
      debug:
        msg: "{{ targets | selectattr('instance_type', 'match', '^r5\\..+') | list }}"

実行結果

$ ansible-playbook -i localhost, hoge.yml 

PLAY [localhost] ********************************************************************************************************************************************************

TASK [list match] *******************************************************************************************************************************************************
ok: [localhost] => {
    "msg": [
        {
            "instance_id": 2, 
            "instance_type": "r5.large"
        }
    ]
}

PLAY RECAP **************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0

否定は selectattr を rejectattr に変更すれば良い．