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<p>我有一个要从中提取字段的有效负载:</p>
<p><code>{"encrypted_sender_transaction_id":"514658451","donation_info":{"tid":321654658,"ppgf_donation_id":4654564,"pp_transaction_id":19446119405222584,"nonprofit_id":6454,"amount":1,"gross_amount":1,"currency_code":"USD","type":"U","party_id":"2313654","product_type":"DN","is_recurring":false,"transaction_time":"2018-06-04","donor_name":"Foo Bar","donor_email_address":"foo.bar@foobar.com","is_donor_sharing_contact":true,"product_description":"PayPal Donations with PPGF","partner_name":"PayPal","receiver_transaction_id":13214,"encrypted_transaction_id":"4564","receiver_account_number":"123","methodof_donation":"4001","encrypted_pptxn_id":"123","update":false},"payout_date":"2018-06-25","charity_type":"PPGF","charity_info":{"name":"Comic Relief Red Nose Day","address":{"line1":"123 Foobar Ave, 123th Floor","line2":"","city":"New York","state":"NY","postal_code":"123123","country_code":"US","phone":"123418","latitude":"123.45675876","longitude":"-7213.97493"},"state":"Confirmed","confirmation_date":"2016-04-19","logo_url":"https://pics.paypal.com/00/s/Mjg0ZDUwOWMtY2U3ZS00NjVhLWJkMDUtMGE2Y2RiZDIxODc4/file.JPG","mission_area":[{"id":1015,"name":"Philanthropy, Grants, Other","is_primary":true},{"id":1012,"name":"Human Services","is_primary":false}],"adhoc_ppgf":false,"mission":"Philanthropy, Grants, Other"},"payout_status":1,"isResult":true,"convertedpytdate":"Jun 25, 2018","convertedtransactdate":"Jun 4, 2018","transaction_id":"43934096XX104234C"}</code></p>
<p>我想提取的字段是<code>"amount":1</code>,尤其是<code>1</code>值。我知道正则表达式是一种很明显的方法,但它让我很困惑!我应该搜索字符串并使用<code>str[:::]</code>索引吗?(另外:我更改了本例中的所有值,但格式完全相同)。你知道吗</p>