Ansible Text Transformation Filters

- name: Uppercase example
  ansible.builtin.debug:
    msg: "{{ 'hello world' | upper }}"
# Output: HELLO WORLD

- name: Lowercase example
  ansible.builtin.debug:
    msg: "{{ 'Hello World' | lower }}"
# Output: hello world

- name: Capitalize example
  ansible.builtin.debug:
    msg: "{{ 'hello world' | capitalize }}"
# Output: Hello world

- name: Title case example
  ansible.builtin.debug:
    msg: "{{ 'hello world of ansible' | title }}"
# Output: Hello World Of Ansible

- name: Replace text
  ansible.builtin.debug:
    msg: "{{ 'Hello World' | replace('World', 'Ansible') }}"
# Output: Hello Ansible

- name: Regex replace
  ansible.builtin.debug:
    msg: "{{ 'server-01.example.com' | regex_replace('^server-(\\d+)\\..*', 'srv-\\1') }}"
# Output: srv-01

- name: Extract version number
  ansible.builtin.debug:
    msg: "{{ 'ansible-core 2.16.0' | regex_search('(\\d+\\.\\d+\\.\\d+)') }}"
# Output: 2.16.0

- name: Remove whitespace
  ansible.builtin.debug:
    msg: "'{{ '  hello  ' | trim }}'"
# Output: 'hello'

{{ 'hello' | center(20) }}
{{ 'hello' | ljust(20) }}
{{ 'hello' | rjust(20) }}

- name: Wrap long text
  ansible.builtin.debug:
    msg: "{{ long_text | wordwrap(60) }}"

- name: Truncate text
  ansible.builtin.debug:
    msg: "{{ 'This is a very long description' | truncate(20) }}"
# Output: This is a very lo...

- name: Set normalized hostname
  ansible.builtin.hostname:
    name: "{{ custom_hostname | lower | replace(' ', '-') | regex_replace('[^a-z0-9-]', '') }}"

vars:
  app_name: "My Application"
  environment: "production"

tasks:
  - name: Generate env file
    ansible.builtin.copy:
      content: |
        APP_NAME={{ app_name | upper | replace(' ', '_') }}
        ENVIRONMENT={{ environment | upper }}
        LOG_LEVEL={{ 'DEBUG' if environment == 'development' else 'INFO' }}
      dest: /etc/myapp/.env

- name: Create log directory per environment
  ansible.builtin.file:
    path: "/var/log/{{ app_name | lower | replace(' ', '-') }}/{{ env | lower }}"
    state: directory

{# nginx.conf.j2 #}
server {
    server_name {{ domain | lower }};
    root /var/www/{{ domain | lower | replace('.', '_') }};

    {% for header_name, header_value in custom_headers.items() %}
    add_header {{ header_name | title | replace('_', '-') }} "{{ header_value }}";
    {% endfor %}
}

- name: Create user from input
  ansible.builtin.user:
    name: "{{ requested_username | lower | regex_replace('[^a-z0-9_-]', '') | truncate(32, true, '') }}"
    state: present

# Multiple filters in sequence
msg: "{{ raw_input | trim | lower | replace(' ', '_') | truncate(32, true, '') }}"

# With default for undefined variables
msg: "{{ hostname | default('localhost') | upper }}"