Use ansible variable in replace string for regex_replace

Question

I want to generate a new list from files by prepending /auto and appending _sw_table to each element. While I can do this by explicitly mentioning the new strings as args to regex_replace in map, I want to achieve the same using variables. The following works:

- hosts: localhost
  gather_facts: no
  tasks:
  - set_fact:
      my_lst: []
      top_dir: /auto
      extra: sw_table
      files: ['/etc/passwd', '/etc/group']

  - set_fact:
      my_lst: "{{ files | map('regex_replace', '(.*)', '/auto\\1_sw_table') | list }}"

  - debug: var=my_lst

Output:

$ ansible-playbook -i localhost, ./test.yaml 

PLAY [localhost] **************************************************************************************************

TASK [set_fact] ***************************************************************************************************
ok: [localhost]

TASK [set_fact] ***************************************************************************************************
ok: [localhost]

TASK [debug] ******************************************************************************************************
ok: [localhost] => {
    "my_lst": [
        "/auto/etc/passwd_sw_table", 
        "/auto/etc/group_sw_table"
    ]
}

How can I use the variables top_dir and extra in the call to map to get the same result?

Matt P · Accepted Answer · 2019-10-31 23:58:54Z

8

You can use string concatenation in Jinja2:

  - set_fact:
      my_lst: "{{ files | map('regex_replace', '(^.*$)', top_dir + '\\1' + extra) | list }}"

Do take note of the updated regex pattern that I used. I had different results to your output above, and needed to update the pattern.

answered Oct 31, 2019 at 23:58

Matt P

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