playbook.yaml

---
- hosts: localhost
  gather_facts: no
  tasks:
  - name: "loop through list"
    debug:
      msg: "An item: {{ item }}"
    with_items:
      - 1
      - 2
      - 3

  - name: Create the list
    set_fact:
      my_list:
        - "One fish"
        - "Two fish"
        - "Red fish"
        - "Blue fish"

  - name: "loop through list - flat 1"
    debug:
      msg: "Flat items: {{ my_list | join(' --option ') }}"

  - name: "set_fact"
    set_fact:
      my_list: "{{ my_list | map('regex_replace', '^(.*)$', 'PREFIX \\1 SUFFIX') | list }}"

  - name: "loop through list - flat 2"
    debug:
      msg: "Flat items: {{ my_list | join(' ') }}"