ansible 正则表达式不适用于数字

发布于 2025-01-11 14:01:22 字数 946 浏览 0 评论 0原文

我的 ansible 剧本摘录

- name: replace variable
  ansible.builtin.replace:
    path: "{{ item }}"
    regexp: '(?x)(--my_variable(\s|\t)*=(\s|\t)*")(.*?)((\")(\s\\\n)|(\"(\s|\t)))'
    replace: "\\1{{ my_number }}\\5"

该变量的值为 222

我在 ansible 库中有一个变量 my_number当 行替换：“\\1{{ my_number } 时， }\\5" 被执行我收到一条错误消息但是，如果我用字符串替换变量，我的捕获组是错误的，即 “my_number = ytiuytuytiu”一切按预期工作，而“my_number = 3333”失败。

我的问题

my_number 是数字时为什么替换失败？

为什么 my_number 是字符串时替换成功？

如何解决这个问题？

正则表达式是为了匹配和替换这种类型的字符串而设计的，

 --my_variable="333" \

错误看起来像这样

raise s.error(\"invalid group reference %d\" % index, pos)\r\nsre_constants.error: invalid group reference 18 at position 1\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1

原文

an excerpt from my ansible playbook

- name: replace variable
  ansible.builtin.replace:
    path: "{{ item }}"
    regexp: '(?x)(--my_variable(\s|\t)*=(\s|\t)*")(.*?)((\")(\s\\\n)|(\"(\s|\t)))'
    replace: "\\1{{ my_number }}\\5"

I have a variable in ansible vault my_number this variable has a value 222

when the line replace: "\\1{{ my_number }}\\5" gets executed I get an error saying
that my capture group is wrong, however, if I replace variable with a string literal, i.e
"my_number = ytiuytuytiu" everything works as expected where "my_number = 3333" fails.

My questions

Why does it fail to replace when my_number is a number?

why does it succeed to replace when my_number is a String?

How to solve this issue?

P.S

Regex is crafted to match and replace the strings of this type

 --my_variable="333" \

The error looks like this

raise s.error(\"invalid group reference %d\" % index, pos)\r\nsre_constants.error: invalid group reference 18 at position 1\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1

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傲鸠 2025-01-18 14:01:22

当 ansible 做一些奇怪的事情时，解决方案几乎总是增加详细程度 ansible-playbook -vv 这将向您显示实际的模块参数，并希望引导您找到解决方案：通过用数字替换使用 \1 语法，它会变成 \1333，无论正则表达式引擎如何将其切碎，都是非法的反向引用

python re.sub 手册说 \g<1> ; 是明确的样式：

- name: replace variable
  ansible.builtin.replace:
    path: "{{ item }}"
    regexp: '(?x)(--my_variable(\s|\t)*=(\s|\t)*")(.*?)((\")(\s\\\n)|(\"(\s|\t)))'
    replace: '\g<1>{{ my_number }}\g<5>'

When ansible is doing something weird, the solution is almost always to increase the verbosity ansible-playbook -vv which would have shown you the actual module arguments, and hopefully led you to the solution: by substituting in numbers with that \1 syntax, it becomes \1333 which no matter how the regex engine chopped it up, is an illegal backreference

The python re.sub manual says that \g<1> is the unambiguous style:

- name: replace variable
  ansible.builtin.replace:
    path: "{{ item }}"
    regexp: '(?x)(--my_variable(\s|\t)*=(\s|\t)*")(.*?)((\")(\s\\\n)|(\"(\s|\t)))'
    replace: '\g<1>{{ my_number }}\g<5>'

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