extrai parte da linha JSON

Question

Eu tenho várias linhas JSON que são bem longas (~ 1.5KB) e podem ser parecidas com: "XYZ":{"myString":"myValue",ABCD}

e eu só quero extrair "myString": "myValue" da linha inteira. grep sozinho não me ajuda, já que está tudo em uma linha, pensei em canalizar a saída de grep para awk , mas o divisor não parece funcionar conforme necessário. Alguém pode ajudar aqui?

Mente, o documnent não é um documento somente JSON. Há muito conteúdo no arquivo e parte dele são linhas JSON das quais eu gostaria de extrair o myValue (como parte do myString). Um exemplo pode parecer:

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     ....other content...!: {"response":{"container":{"id":"655ccc89-915c-4aae-a927-cca34bbedc29","timestamp":"2018-May-30 
21:05:29.789543"},"id":"00000002-0000-0000-0000-000000000003"},"frames":{"frame":
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Answer 1

Supondo que a string esteja em um arquivo e constitua um documento JSON completo e bem formado, o comando a seguir extrairia o valor correspondente a qualquer chave myString no documento:

jq -r '..|select(type == "object" and has("myString")).myString' file.json

A expressão jq seleciona recursivamente objetos JSON no documento que possui uma chave myString e, em seguida, extrai o valor dessa chave.