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我现在有这样一组字符串
1、[{"history_id":"1323952","task_id":"30461","backup_file_name":"","complete_time":"0","file_size":"0"}]
2、{"history_id":"1323952","task_id":"13221","backup_file_name":"","complete_time":"0","file_size":"0"}
我需要用一个表达式来获取这两个数组中得task_id,请问怎么获取,,,,,,,各位大神
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