regex101: Match value with excluding prefix and sufix

Regular Expression

(?<=\"id\"\:)\d+(?=\,)

New

{
    "id": 5987431,
    "remoteRef": "f150edeab22e5458a8d5db64280023f0",
    "paymentEntityType": "Bank",
    "accountHolder": "Svilen Varbanov",
    "accountNumber": "********6691",
    "expiresEnd": null,
    "paymentEntityStatus": "Unverified",
    "token": null,
    "canDeposit": false,
    "canWithdraw": false,
    "lastUsed": false,
    "cardType": null,
    "logs": [
        {
            "paymentEntityStatus": "Unverified",
            "message": "Bank payment entity has been created.",
            "updated": "2019-10-01 11:49:22Z"
        }
    ],
    "transactionSummaries": null,
    "paymentGateway": "RBC",
    "details": {
        "bankName": null,
        "sortCode": null,
        "swiftCode": null,
        "branchCode": null,
        "branchAddress": null,
        "transitNumber": "340",
        "institutionNumber": "34103",
        "accountId": "575876691"
    },
    "createdAt": "2019-10-01T11:49:22.4680708Z"
}

Regular Expressions 101

Regular Expression

Extraction