powershell 提取两个字符串之间的文本 [英] powershell extract text between two strings

问题描述

我知道以前有人问过这个问题，但我无法得到任何我看过的答案.我有一个包含数千行的 JSON 文件，我想在两个字符串每次出现时简单地提取它们之间的文本(很多).

I know this question has been asked before but I can't get any of the answers I have looked at to work. I have a JSON file which has thousands of lines and want to simply extract the text between two strings every time they appear (which is a lot).

作为一个简单的例子，我的 JSON 看起来像这样:

As a simple example my JSON would look like this:

    "customfield_11300": null,
    "customfield_11301": [
      {
        "self": "xxxxxxxx",
        "value": "xxxxxxxxx",
        "id": "10467"
      }
    ],
    "customfield_10730": null,
    "customfield_11302": null,
    "customfield_10720": 0.0,
    "customfield_11300": null,
    "customfield_11301": [
      {
        "self": "zzzzzzzzzzzzz",
        "value": "zzzzzzzzzzz",
        "id": "10467"
      }
    ],
    "customfield_10730": null,
    "customfield_11302": null,
    "customfield_10720": 0.0,

所以我想输出customfield_11301"和customfield_10730"之间的所有内容:

So I want to output everything between "customfield_11301" and "customfield_10730":

      {
        "self": "xxxxxxxx",
        "value": "xxxxxxxxx",
        "id": "10467"
      }
    ],
      {
        "self": "zzzzzzzzzzzzz",
        "value": "zzzzzzzzzzz",
        "id": "10467"
      }
    ],

我试图让它尽可能简单 - 所以不要在意输出中显示的括号.

I'm trying to keep it as simple as possible - so don't care about brackets being displayed in the output.

这就是我所拥有的(输出的比我想要的多):

This is what I have (which outputs way more than what I want):

$importPath = "todays_changes.txt"
$pattern = "customfield_11301(.*)customfield_10730"

$string = Get-Content $importPath
$result = [regex]::match($string, $pattern).Groups[1].Value
$result

推荐答案

快速答案是 - 将你的贪婪捕获 (.*) 更改为非贪婪 - (.*?).应该这样做.

The quick answer is - change your greedy capture (.*) to non greedy - (.*?). That should do it.

customfield_11301(.*?)customfield_10730

否则捕获会吃得尽可能多，导致它一直持续到最后一个customfield_10730.

Otherwise the capture will eat as much as it can, resulting in it continuing 'til the last customfield_10730.

问候

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