Question

给出以下Ideal2.json


[
    {
    "url": "/classroom-videos/lesson1/sublesson1/video",
        "data": {
            "fieldset": "lesson-video-overview",
            "title": "5th Grade Math - Interpreting Fractions",
        },
        "order": 4
    },
    {
    "url": "/classroom-videos/lesson1/sublesson2/video",
        "data": {
            "fieldset": "lesson-video-clip-single",
            "title": "Post-Lesson Debrief Part 5",
        },
        "order": 14
    },
    {
        "url" : "about-us",
        "data": {
            "fieldset": "lesson-video-clip-single",
            "title": "Lesson Part 2B",
        },
        "order": 6
    }
]

我只想提取网址以/classroom-videos/开头的项目

理想情况下，我的输出如下所示：


[
    {
    "url": "/classroom-videos/lesson1/sublesson1/video",
        "data": {
            "fieldset": "lesson-video-overview",
            "title": "5th Grade Math - Interpreting Fractions",
        },
        "order": 4
    },
    {
    "url": "/classroom-videos/lesson1/sublesson2/video",
        "data": {
            "fieldset": "lesson-video-clip-single",
            "title": "Post-Lesson Debrief Part 5",
        },
        "order": 14
    }
]

我没有运气就尝试了很多变化：例如 select(.url | contains("yomama"))产生 jq：错误（在：47）：无法使用字符串“ url”索引数组退出状态5

.[].url生成一个很好的所有URL列表

Answer 1

看起来这可以解决问题：

jq '.[] | select(.url |test("classroom-videos"))'

Answer 2

或者，使用基于行走路径的unix实用程序 jtc ，可以透明地实现相同的JSON操作：

bash $ <ideal2.json jtc -w'<^/classroom-videos/>R:[-1]' -j
[
   {
      "data": {
         "fieldset": "lesson-video-overview",
         "title": "5th Grade Math - Interpreting Fractions"
      },
      "order": 4,
      "url": "/classroom-videos/lesson1/sublesson1/video"
   },
   {
      "data": {
         "fieldset": "lesson-video-clip-single",
         "title": "Post-Lesson Debrief Part 5"
      },
      "order": 14,
      "url": "/classroom-videos/lesson1/sublesson2/video"
   }
]

第一个步行路径词素（<^/classroom-videos/>R:）递归查找标签与REGEX（后缀R）相匹配的每条记录；找到后，jtc将备份1级（lexeme [-1]），该级别将指向父记录
-j将所有找到（遍历）的条目包装到JSON数组中

PS>披露：我是jtc-用于JSON操作的shell cli工具的创建者

选择匹配的子字符串

2 个答案: