我从 Streaming API 爬取了 twitter JSON文件，得到了一个包含数千行 JSON 数据的文件。但是，此数据包含很多元素，例如“创建日期”、“来源”、“推文文本”等。我实际上想过滤推文文本中的“iphone”一词。但是，如果我使用 GREP UNIX 进行过滤，它不仅会过滤掉“推文文本”字段，还会过滤掉“源”字段。因此，这意味着一条不包含单词“iphone”但从 Twitter for Iphone 发布的推文（如“来源”字段中所述）也将被过滤。
无论如何，是否仅在某个特定字段中过滤此 JSON（在我的情况下，它是“推文文本”字段）。
这是一个 JSON 行的示例：
{"created_at":"Tue Aug 20 03:48:27 +0000 2013","id":369667218608369666,"id_str":"369667218608369666","text":"@Mattyb_chyeah_ yeah I'm only watching him! :)","source":"\u003ca href=\"http:\/\/twitter.com\/download\/iphone\" rel=\"nofollow\"\u003eTwitter for iPhone\u003c\/a\u003e","truncated":false,"in_reply_to_status_id":369666992334073856,"in_reply_to_status_id_str":"369666992334073856","in_reply_to_user_id":1557571363,"in_reply_to_user_id_str":"1557571363","in_reply_to_screen_name":"Mattyb_chyeah_","user":{"id":1325959333,"id_str":"1325959333","name":"MattyBRapsTexas","screen_name":"MattyBRapsTexas","location":"Atlanta,Georgia","url":"http:\/\/www.instagram.com\/mattybrapstexas","description":"3 RT 6 Mentions He followed me on 4\/15\/13 6\/17\/13 Maddi Jane followed me on 6\/18\/13 @8:25pm! Cimorelli also follows Pizza Hut mentioned me 2 times on 7\/26\/13","protected":false,"followers_count":1095,"friends_count":426,"listed_count":8,"created_at":"Thu Apr 04 02:34:56 +0000 2013","favourites_count":226,"utc_offset":-14400,"time_zone":"Eastern Time (US & Canada)","geo_enabled":false,"verified":false,"statuses_count":3447,"lang":"en","contributors_enabled":false,"is_translator":false,"profile_background_color":"C0DEED","profile_background_image_url":"http:\/\/a0.twimg.com\/images\/themes\/theme1\/bg.png","profile_background_image_url_https":"https:\/\/si0.twimg.com\/images\/themes\/theme1\/bg.png","profile_background_tile":false,"profile_image_url":"http:\/\/a0.twimg.com\/profile_images\/378800000313651225\/afee0cc2286882eeb15f21ed7fae334a_normal.jpeg","profile_image_url_https":"https:\/\/si0.twimg.com\/profile_images\/378800000313651225\/afee0cc2286882eeb15f21ed7fae334a_normal.jpeg","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/1325959333\/1376759786","profile_link_color":"0084B4","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"default_profile":true,"default_profile_image":false,"following":null,"follow_request_sent":null,"notifications":null},"geo":null,"coordinates":null,"place":null,"contributors":null,"retweet_count":0,"favorite_count":0,"entities":{"hashtags":[],"symbols":[],"urls":[],"user_mentions":[{"screen_name":"Mattyb_chyeah_","name":"MattyB (\u2661_\u2661\u2740)","id":1557571363,"id_str":"1557571363","indices":[0,15]}]},"favorited":false,"retweeted":false,"filter_level":"medium","lang":"en"