---
- name: Something
  hosts: temp
  become: false
  gather_facts: true

  tasks:
    - name: Read the conf file
      ansible.builtin.slurp:
        src: /etc/rear/local.conf
      register: slurp_local_conf

    - name: Debug local_conf_content
      ansible.builtin.debug:
        var: slurp_local_conf

    - name: Decode the conf file content
      ansible.builtin.set_fact:
        local_conf_content: "{{ slurp_local_conf['content'] | b64decode }}"

    - name: Debug local_conf_content
      ansible.builtin.debug:
        var: local_conf_content

    - name: Extract the NFS server address
      ansible.builtin.set_fact:
        nfs_server: "{{ local_conf_content | regex_search('nfs://(.*?)/', '\\1') | first }}"

    - name: Debug nfs_server
      ansible.builtin.debug:
        var: nfs_server