我有一个日志文件，其中包含与json字符串混合的“随机”内容。我想要的是，从json字符串中提取某些变量/值对，但我不确定如何做到这一点。例如，我有这样的东西：

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并假设我想提取文件中每一行JSON的“licenseplate”和以下“confidence”值。如何在bash中做到最好？