filter - 如何过滤字符串中的某些元素

Question

playbook.yml

---
  hosts: local_host
  connection: local
  gather_facts: False
  tasks:
  - name: set-details
    set_fact:
      filter: "{{ lookup('file', 'tmp/task2.yml') | from_json }}"

  - set_fact:
      result: "{{ filter['msg'] }}"

  - debug:
      var: result

task2.yml

{
    "ansible_loop_var": "item",
    "_ansible_no_log": false,
    "invocation": {
        "module_args": {
            "wait_for_task": true,
            "policy_package": "Mills07_Simplified",
            "version": null,
            "wait_for_task_timeout": 30
        }
    },
    "item": "Mills07_Simplified",
    "changed": false,
    "msg": "Task Verify policy operation with task id 01234567-89ab-cdef-928b-bef7e174fc7a failed. Look at the logs for more details",
    "_ansible_item_label": "Mills07_Simplified"
}

调试信息

TASK [debug] *****************************************************************************************************************************************************************************
ok: [localhost] => {
    "result": "Task Verify policy operation with task id 01234567-89ab-cdef-928b-bef7e174fc7a failed. Look at the logs for more details"
}

当我做了以下事情时，

  - set_fact:
      task_id: "{{ result |
                   select('regex', my_regex)|
                   first|
                   regex_replace(my_regex, my_replace) }}"

      vars:
        my_regex: '^Task Verify policy operation with task id (.*)$'
        my_replace: '\1'
  - debug:
      var: task_id 

我收到一条错误消息

fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'my_regex' is undefined\n\nThe error appears to be in 

目标 :我想获得任务 ID“ 01234567-89ab-cdef-928b-bef7e174fc7a _0x10456792”
我怎样才能得到这个字符串 01234567-89ab-cdef-928b-bef7e174fc7a

Answer 1

由于您正在寻找 universally unique identifier (or UUID) ，它具有 8-4-4-4-12 字符的定义格式，总共 36 个字符(32 个十六进制字符和 4 个连字符) source ，您可以使用简单的正则表达式来提取它。
可以使用以下正则表达式处理:

[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}

你可以在那里测试: https://regex101.com/r/4Hs7il/1
因此，在 set_fact 中:

- set_fact:
    uuid: >- 
      {{ filter.msg 
          | regex_search(
              '([0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12})', 
              '\1', 
              ignorecase=True
            ) 
          | first 
      }}

举个例子:

- hosts: localhost
  gather_facts: no

  tasks:
    - set_fact:
        uuid: >- 
          {{ filter.msg 
              | regex_search(
                  '([0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12})', 
                  '\1', 
                  ignorecase=True
                ) 
              | first 
          }}
      vars:
        filter:
          msg: "Task Verify policy operation with task id 01234567-89ab-cdef-928b-bef7e174fc7a failed. Look at the logs for more details"

    - debug:
        var: uuid

将产生回顾:

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

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

TASK [debug] *******************************************************************
ok: [localhost] => 
  uuid: 01234567-89ab-cdef-928b-bef7e174fc7a

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