在条件测试中使用带有反斜杠的字符串时出现“错误转义”错误

Question

好的。所以我有一个 ansible 剧本，如果在我循环的列表中找到特定值，我希望执行一个任务。任务看起来像这样：

- name: check to see if reg values have already been added
  set_fact:
    regpres: true
  loop: "{{ reg.value }}"
  when: item is search('-Dtaxlink.log.location=C:\taxlink\logs')

但是，当我运行此任务时，出现以下错误：

"msg": "The conditional check 'item is search('-Dtaxlink.log.location=C:\\taxlink\\logs')' failed. The error was: bad escape \\l

我什至尝试将任务中的反斜杠加倍，这使得它看起来像这样：

- name: check to see if reg values have already been added
  set_fact:
    regpres: true
  loop: "{{ reg.value }}"
  when: item is search('-Dtaxlink.log.location=C:\\taxlink\\logs')

我几乎再次遇到了完全相同的错误：

"msg": "The conditional check 'item is search('-Dtaxlink.log.location=C:\\\\taxlink\\\\logs')' failed. The error was: bad escape \\l

谁能帮我弄清楚这是怎么回事？

已经回答了。不玩这个游戏。/

Answer 1

search()

测试接受正则表达式作为参数，而不是纯字符串。用 4 个反斜杠转义是有效的：

# playbook.yaml
---
- hosts: localhost
  gather_facts: false
  vars:
    reg:
      value:
        - -Dtaxlink.log.location=C:\taxlink\logs
        - -Dtaxlink.log.location=D:\taxlink\logs
        - -Dtaxlink.log.location=E:\taxlink\logs
        - -Dtaxlink.log.location=C:\\taxlink\\logs
  tasks:
    - name: check to see if reg values have already been added
      set_fact:
        regpres: true
      loop: "{{ reg.value }}"
      when: item is search('-Dtaxlink.log.location=C:\\\\taxlink\\\\logs')

    - name: Output the registered variable
      debug:
        var: regpres

$ ansible-playbook playbook.yaml 

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

TASK [check to see if reg values have already been added] **************************************************************************************************************************************************************************************
ok: [localhost] => (item=-Dtaxlink.log.location=C:\taxlink\logs)
skipping: [localhost] => (item=-Dtaxlink.log.location=D:\taxlink\logs) 
skipping: [localhost] => (item=-Dtaxlink.log.location=E:\taxlink\logs) 
skipping: [localhost] => (item=-Dtaxlink.log.location=C:\\taxlink\\logs) 

TASK [Output the registered variable] **********************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "regpres": true
}

PLAY RECAP *************************************************************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0