How do I fill a property, whether unique or not, in a file using lineinfile?

Get Help
3

Try this:

---
- hosts: pg_servers

  vars:
    path: postgresql.conf
    splibs_regex: "^#?(shared_preload_libraries\\s+=\\s+')([^']*)('.*$)"
    extra_splibs:
      - pg_stat_statements

  tasks:
    - name: read file
      ansible.builtin.slurp:
        src: "{{ path }}"
      register: pgconf

    - ansible.builtin.set_fact:
        matches: "{{ pgconf.content | b64decode | regex_search(splibs_regex, '\\1', '\\2', '\\3', multiline=True) }}"

    - ansible.builtin.lineinfile:
        path: "{{ path }}"
        regexp: "{{ splibs_regex }}"
        line: "{{ matches[0] ~ matches[1] | split(',') | reject('equalto', '') | union(extra_splibs) | join(',') ~ matches[2] }}"
      when: matches