Hi - Does anyone (who understands how backslashes work in Ansible/YAML)
know why both of the following tasks work:
(ansible2_15_8) rowagn@localhost:~#> cat d.yml
- hosts: all
gather_facts: no
vars:
s: 'This is a string containing 1 and 2.'
t:
- p1_xyz
- p2_xyz
- p4_xyz
tasks:
- name: single backslash
debug:
msg: '{{ item }} is in s'
loop: '{{ t }}'
when: ( item | regex_replace('^p(\d+).*$', '\\1') ) in s
- name: double backslash
debug:
msg: '{{ item }} is in s'
loop: '{{ t }}'
when: ( item | regex_replace('^p(\\d+).*$', '\\1') ) in s
(ansible2_15_8) rowagn@localhost:~#> ansible-playbook -i l d.yml
PLAY [all]
******************************************************************************************************************************************************
TASK [single backslash]
*****************************************************************************************************************************************
ok: [localhost] => (item=p1_xyz) => {
"msg": "p1_xyz is in s"
}
ok: [localhost] => (item=p2_xyz) => {
"msg": "p2_xyz is in s"
}
skipping: [localhost] => (item=p4_xyz)
TASK [double backslash]
*****************************************************************************************************************************************
ok: [localhost] => (item=p1_xyz) => {
"msg": "p1_xyz is in s"
}
ok: [localhost] => (item=p2_xyz) => {
"msg": "p2_xyz is in s"
}
skipping: [localhost] => (item=p4_xyz)
PLAY RECAP
******************************************************************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0
skipped=0 rescued=0 ignored=0
The tasks are extracting the number from the strings in list t and then
looking for that number in string s. What is strange is the second example
at
https://docs.ansible.com/ansible/latest/collections/ansible/builtin/regex_replace_filter.html#examples
indicates the backslashes in both parameters need to be doubled, but the
above testing shows double backslashes are not required in the first
parameter (they are required in the second parameter).
Thanks
Rob
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