如何从变量中删除多余的垃圾？答案

【问题标题】：How to remove excess garbage from a variable?如何从变量中删除多余的垃圾？
【发布时间】：2022-01-14 06:38:06
【问题描述】：

如何删除多余的引号和逗号，以便只保留有用的信息？这是一个可以使用的变量：

"ping.stdout_lines": [
    [
        "p",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "",
        "  SEQ HOST                                 SIZE TTL TIME  STATUS           ",
        "    0 192.168.0.1                            56  64 1ms  ",
        "    1 192.168.0.1                            56  64 1ms  ",
        "    2 192.168.0.1                            56  64 1ms  ",
        "    3 192.168.0.1                            56  64 1ms  ",
        "    4 192.168.0.1                            56  64 1ms  ",
        "    sent=5 received=5 packet-loss=0% min-rtt=1ms avg-rtt=1ms max-rtt=1ms"
    ]
]

我尝试通过正则表达式来做，但没有任何结果。

想要的结果：

        SEQ HOST                                   SIZE TTL TIME  STATUS           
            0 192.168.0.1                            56  64 1ms  
            1 192.168.0.1                            56  64 1ms  
            2 192.168.0.1                            56  64 1ms  
            3 192.168.0.1                            56  64 1ms  
            4 192.168.0.1                            56  64 1ms  
            sent=5 received=5 packet-loss=0% min-rtt=1ms avg-rtt=1ms max-rtt=1ms

我怎么也想不通。

【问题讨论】：

标签： regex ansible yaml

【解决方案1】：

直接使用 select 没有测试它会拒绝空行，例如

    - debug:
        msg: "{{ item|select }}"
      loop: "{{ ping.stdout_lines }}"

给予

  msg:
  - p
  - '  SEQ HOST                                 SIZE TTL TIME  STATUS           '
  - '    0 192.168.0.1                            56  64 1ms  '
  - '    1 192.168.0.1                            56  64 1ms  '
  - '    2 192.168.0.1                            56  64 1ms  '
  - '    3 192.168.0.1                            56  64 1ms  '
  - '    4 192.168.0.1                            56  64 1ms  '
  - '    sent=5 received=5 packet-loss=0% min-rtt=1ms avg-rtt=1ms max-rtt=1ms'

如果要将过滤后的数据保存在变量中

  pings: "{{ ping.stdout_lines|map('select')|list }}"

给予

  pings:
  - - p
    - '  SEQ HOST                                 SIZE TTL TIME  STATUS           '
    - '    0 192.168.0.1                            56  64 1ms  '
    - '    1 192.168.0.1                            56  64 1ms  '
    - '    2 192.168.0.1                            56  64 1ms  '
    - '    3 192.168.0.1                            56  64 1ms  '
    - '    4 192.168.0.1                            56  64 1ms  '
    - '    sent=5 received=5 packet-loss=0% min-rtt=1ms avg-rtt=1ms max-rtt=1ms'

【讨论】：