找到的错误类型：

Question

我有一个JSON数据文件（如下所示），我试图使用https://regex101.com/实用程序查找字段值。

除了字段，如果密钥名称中包含-短划线字符，它的工作正常。

如何获取＆＃34; field-2 ＆＃34;，＆＃34; field-three ＆＃34;的值？或＆＃34; field-three.url ＆＃34; for content.book1下的元素（至少使用jq）？

我尝试了以下操作来获取值，但是对于键名在其中包含短划线-的字段，它会给我以下错误。我试图反对削减-字符，但这也没有帮助。

找到的错误类型：

jq: error (at <stdin>:27): null (null) and number (2) cannot be subtracted
jq: 1 compile error

jq: error: three/0 is not defined at <top-level>

jq: error: syntax error, unexpected INVALID_CHARACTER, expecting $end (Unix shell quoting issues?) at <top-level>

jq: error: syntax error, unexpected INVALID_CHARACTER, expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:

命令：

$ cat /tmp/my.data.json
{
  "pages": {
    "book1": [
      "page1",
      "page2-para1",
      "page3-para1-sentence1",
      "page3-para2-sentence3-word4"
    ]
  },
  "content": {
    "book1": {
      "name": "giga",
      "url": "-",
      "field1": "value1",
      "field-2": "value-2",
      "field-three": {
        "name": "THIRD",
        "url": "book1/field-three/",
        "short-url": "book1/field-three/chota-chetan"
      },
      "authur": {
        "name": "lori CHUCK",
        "displayIndex": 4
      },
      "route": "/in-gc/hindi-chini-bhai-bhai"
    }
  }
}

$ cat /tmp/my.data.json| jq ".pages"
{
  "book1": [
    "page1",
    "page2-para1",
    "page3-para1-sentence1",
    "page3-para2-sentence3-word4"
  ]
}

$ cat /tmp/my.data.json| jq ".pages.book1[0]"
"page1"

$ cat /tmp/my.data.json| jq ".pages.book1[1]"
"page2-para1"

$ cat /tmp/my.data.json| jq ".content"
{
  "book1": {
    "name": "giga",
    "url": "-",
    "field1": "value1",
    "field-2": "value-2",
    "field-three": {
      "name": "THIRD",
      "url": "book1/field-three/"
    },
    "authur": {
      "name": "lori CHUCK",
      "displayIndex": 4
    },
    "route": "/in-gc/hindi-chini-bhai-bhai"
  }
}

$ cat /tmp/my.data.json| jq ".content.book1"
{
  "name": "giga",
  "url": "-",
  "field1": "value1",
  "field-2": "value-2",
  "field-three": {
    "name": "THIRD",
    "url": "book1/field-three/"
  },
  "authur": {
    "name": "lori CHUCK",
    "displayIndex": 4
  },
  "route": "/in-gc/hindi-chini-bhai-bhai"
}

$ cat /tmp/my.data.json| jq ".content.book1.name"
"giga"

$ cat /tmp/my.data.json| jq ".content.book1.field1"
"value1"

$ cat /tmp/my.data.json| jq ".content.book1.field-2"
jq: error (at <stdin>:27): null (null) and number (2) cannot be subtracted

$ cat /tmp/my.data.json| jq ".content.book1.field-three"
jq: error: three/0 is not defined at <top-level>, line 1:
.content.book1.field-three
jq: 1 compile error

$ cat /tmp/my.data.json| jq ".content.book1.field-three.url"
jq: error: three/0 is not defined at <top-level>, line 1:
.content.book1.field-three.url
jq: 1 compile error

$ cat /tmp/my.data.json| jq ".content.book1.field\-2"       
jq: error: syntax error, unexpected INVALID_CHARACTER, expecting $end (Unix shell quoting issues?) at <top-level>, line 1:
.content.book1.field\-2                    
jq: 1 compile error

$ cat /tmp/my.data.json| jq ".content.book1.field\\-2"
jq: error: syntax error, unexpected INVALID_CHARACTER, expecting $end (Unix shell quoting issues?) at <top-level>, line 1:
.content.book1.field\-2                    
jq: 1 compile error

$ cat /tmp/my.data.json| jq ".content.book1.'field-2'"
jq: error: syntax error, unexpected INVALID_CHARACTER, expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:
.content.book1.'field-2'               
jq: 1 compile error

$ cat /tmp/my.data.json| jq ".content.book1.authur"
{
  "name": "lori CHUCK",
  "displayIndex": 4
}

$ cat /tmp/my.data.json| jq ".content.book1.route"
"/in-gc/hindi-chini-bhai-bhai"

$

PS： 我已经知道egrep，这不是我想要的。

cat /tmp/my.data.json| jq ".content.book1"|egrep "short-url|field-2"
  "field-2": "value-2",
    "short-url": "book1/field-three/chota-chetan"

和有人在这里做得很好：jq

Answer 1

“ - ”用于jq中的否定。对于具有特殊字符（如“ - ”）的键名，不能使用简化的“.keyname”语法。有几种选择，但最强大的只是使用.["KEY NAME"]形式，在链接时可以缩写为[“KEY NAME”]，例如.a["b-c"]是.a | .["b-c"]的简写。

如果有疑问，请明确使用管道。

有关详细信息，请参阅jq手册和/或https://github.com/stedolan/jq/wiki/FAQ

Answer 2

我不了解jq，但你把python放在标签中：

$ cat test.json | python -c "import sys, json; print(json.load(sys.stdin)['content']['book1']['field-three']['name'])"
THIRD

或没有管道：

$ python -c "import json; print(json.load(open('test.json'))['content']['book1']['field-three']['name'])"

Answer 3

如jq manual中所述，要处理包含-等非标识符字符的键，您可以使用双引号。

如果您在过滤器周围使用单引号，那么从shell开始这是最简单的。例如，尝试以下命令：

cat /tmp/my.data.json | jq '.pages'
cat /tmp/my.data.json | jq '.pages.book1[0]'
cat /tmp/my.data.json | jq '.pages.book1[1]'
cat /tmp/my.data.json | jq '.content'
cat /tmp/my.data.json | jq '.content.book1'
cat /tmp/my.data.json | jq '.content.book1.name'
cat /tmp/my.data.json | jq '.content.book1.field1'
cat /tmp/my.data.json | jq '.content.book1."field-2"'
cat /tmp/my.data.json | jq '.content.book1."field-three"'
cat /tmp/my.data.json | jq '.content.book1."field-three".url'
cat /tmp/my.data.json | jq '.content.book1.authur'
cat /tmp/my.data.json | jq '.content.book1.route'

Answer 4

嗯......花了一些时间，但最后似乎我们需要 DOUBLE QUOTE ，并且只删除包含-名称的任何键名的双引号。< / p>

$ cat /tmp/my.data.json| jq ".content.book1.\"field-2\""                    
"value-2"

$ cat /tmp/my.data.json| jq ".content.book1.\"field-three\".\"url\""  
"book1/field-three/"

OR 如果你用一个引号'包装所有内容，那么我们不需要反斜杠"双引号，而是在名称中使用-的键名称使用双引号。

$ cat /tmp/my.data.json| jq '.content.book1."field-three"."url"'  
"book1/field-three/"

希望它有所帮助！从https://jqplay.org/

获得一些帮助/提示

有关详情，请参阅此处：https://github.com/stedolan/jq/issues/38#issuecomment-9770240

使用JQ工具实用程序解析或查看JSON数据字段，其中字段名称具有＆＃34; - ＆＃34;破解密钥名称

找到的错误类型：

4 个答案: