title: Ansible return value - Extract a specific line
body: <p>So I got my role working now, the result is now in "var" and I see an output. First of all here is the role which I have written:</p>
  
  <pre><code>- name: create a server
    os_server:
      state: present
      flavor: m1.nano
      auth:
        auth_url: ****
        username: ****
        password: ****
        project_name: admin
        domain_id: ****
      name: ansibletest
  #   region_name: RegionOne
      image: 4e7ab5c8-4b39-4c77-b68d-cf2ea7e1df1a
      key_name: ansible
      timeout: 200
      auto_ip: yes
      nics:
        - net-id: a5a73ab9-3ee5-49a6-bea0-f44f9e376ca0    
    register: result
  - debug: var=result
  </code></pre>
  
  <p>And I get a long output of this like this one:</p>
  
  <pre><code>TASK [openstack : debug] *******************************************************
  ok: [172.20.22.21] =&gt; {
      "result": {
          "changed": false,
          "id": "6f40f396-7ef8-4e0e-9769-2b9cea898269",
              .........
              "accessIPv4": "172.20.22.58",
              .......
                      {
                          ..........
                      },
                      {
                          ............
                          "addr": "172.20.22.58",
                          ......
                      }
                  ]
              },
              ........
              },
              "interface_ip": "172.20.22.58",
              .................
                      .............
                  ]
              },
              "os-extended-volumes:volumes_attached": [],
              "private_v4": "10.0.100.92",
              "progress": 0,
              "public_v4": "172.20.22.58",
              ................
                  {
                     ...........
      }
  }
  </code></pre>
  
  <p>I only need the IP address (in this case it's the <code>172.20.22.58</code> contained in <code>"accessIPv4"</code>) - is there any way to "filter" the output to just retrieve this value?</p>