正则表达式从文件中的行中提取第一组数字

Question

我在这里写了这段代码，我想提取粗体数字（第一次出现）进行比较。

- lineinfile:
    path: /bin/animals.txt
    state: absent
    regexp: '(?i)^\s*chicken\s+[0-9]+\s*$'
  check_mode: yes
  register: egg
- name: comparing number
  debug:
    msg: "chicken lays {{egg}} egg today."
  when: egg > 0

animals.txt 里面（例子）

鸡下了53个蛋，吃了 4 个虫。

更新添加了反向引用

- lineinfile:
    path: /bin/animals.txt
    state: absent
    backrefs: yes
    regexp: '(?i)chicken\D*(\d+)'
  check_mode: yes
  register: egg
- name: comparing number
  debug:
    msg: "chicken lays {{egg}} egg today."
  when: egg > 0