在 JQ 中按正则表达式过滤

Question

[{
  "Address": "The Sq"
 },
 {
  "Address": "1 Bridge Rd"
}]

使用以下 JSON，我如何使用 JQ 编写脚本来过滤正则表达式，其中我希望结果仅为以数字作为第一个字符的地址。我构建这个 JSON 使用

map({ Address: .[].payload.address })

我如何添加到它来过滤我想要的正则表达式（即 \A[0-9]）

Answer 1

虽然接受的答案有效，但我发现这更具可读性

$
$ echo '[{"Address": "The Sq", "n": 1}, {"Address": "1 Bridge Rd", "n": 2}]' | \
  jq '.[] | .Address | select(.|test("^[0-9]"))'

"1 Bridge Rd"
$
$ echo '[{"Address": "The Sq", "n": 1}, {"Address": "1 Bridge Rd", "n": 2}]' | \
  jq '.[] | select(.Address|test("^[0-9]"))'

{
  "Address": "1 Bridge Rd",
  "n": 2
}
$

如果你想做一些不同的过滤：

$ echo '[{"name": "john doe", "sex": "male", "age": 26, "occupation": "city planner", "cod": "asphyxiation"}, {"name": "jane doe", "sex": "male", "age": 24, "occupation": "beautician", "cod": "strangulation"}, {"name": "crispy lips", "sex": "male", "age": 38, "occupation": "convicted killer"} ]' > in.json
$ cat in.json | jq .
[
  {
    "name": "john doe",
    "sex": "male",
    "age": 26,
    "occupation": "city planner",
    "cod": "asphyxiation"
  },
  {
    "name": "jane doe",
    "sex": "male",
    "age": 24,
    "occupation": "beautician",
    "cod": "strangulation"
  },
  {
    "name": "crispy lips",
    "sex": "male",
    "age": 38,
    "occupation": "convicted killer"
  }
]
$

然后我们可以像这样进行基本的正则表达式过滤/转换：

$ cat in.json | jq '.[] | .name'
"john doe"
"jane doe"
"crispy lips"
$
$ cat in.json | jq '.[] | .name | select(.|test(".*doe"))'
"john doe"
"jane doe"
$
$ cat in.json | jq '.[] | select(.name|test(".*doe"))'
{
  "name": "john doe",
  "sex": "male",
  "age": 26,
  "occupation": "city planner",
  "cod": "asphyxiation"
}
{
  "name": "jane doe",
  "sex": "male",
  "age": 24,
  "occupation": "beautician",
  "cod": "strangulation"
}
$ 
$ cat in.json | jq '.[] | select(.name|test(".*doe")) | {n: .name, a: .age}'
{
  "n": "john doe",
  "a": 26
}
{
  "n": "jane doe",
  "a": 24
}
$ 
$ 

Answer 2

如果您将以下过滤器添加到您已有的过滤器上，那么您将获得如下所示的输出：

map(select(.Address | test("^[0-9]")))

输出：

[
  {
    "Address": "1 Bridge Rd"
  }
]

为了健壮性，您可能会考虑?在测试后添加：

map(select(.Address | test("^[0-9]")?))

或者，您可以以map各种方式组合这两个调用。你可能想考虑：

.[].payload.address | select(test("^[0-9]")?) | {Address: .}