如何在Ansible中强制一个变量只有3个字符或者只有数字？

- hosts: localhost
  vars:
    my_variable: "abc"  # 变量值为三个英文字母，满足要求
  tasks:
    - name: Check if variable has 3 characters
      assert:
        that:
          - my_variable is match('^([a-zA-Z]{3})$')  # 正则表达式匹配三个英文字母
      fail_msg: "Variable should have 3 characters"

- hosts: localhost
  vars:
    my_variable: "123"  # 变量值为三个数字，满足要求
  tasks:
    - name: Check if variable has 3 digits
      assert:
        that:
          - my_variable is match('^([0-9]{3})$')  # 正则表达式匹配三个数字
      fail_msg: "Variable should have 3 digits"