从文本中提取 JSON 字符串的正则表达式
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/20916699/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
regular expression to extract JSON string from text
提问by isaaijan
I'm looking for regex to extract json string from text. I have the text below, which contains
我正在寻找正则表达式来从文本中提取 json 字符串。我有下面的文字，其中包含
JSON string(mTitle, mPoster, mYear, mDate)
like that:
像那样：
{"999999999":"138138138","020202020202":{"846":{"mTitle":"\u0430","mPoster":{"
small":"\/upload\/ms\/b_248.jpg","middle":"600.jpg","big":"400.jpg"},"mYear"
:"2013","mDate":"2014-01-01"},"847":{"mTitle":"\u043a","mPoster":"small":"\/upload\/ms\/241.jpg","middle":"600.jpg","big":"
138.jpg"},"mYear":"2013","mDate":"2013-12-26"},"848":{"mTitle":"\u041f","mPoster":{"small":"\/upload\/movies\/2
40.jpg","middle":"138.jpg","big":"131.jpg"},"mYear":"2013","mDate":"2013-12-19"}}}
In order to parse JSON string I should extract JSON string from the text. That is why, my question: Could you help me to get only JSON string from text? Please help.
为了解析 JSON 字符串，我应该从文本中提取 JSON 字符串。这就是为什么，我的问题是：你能帮我从文本中只获取 JSON 字符串吗？请帮忙。
I've tried this regular expression with no success:
我试过这个正则表达式但没有成功：
{"mTitle":(\w|\W)*"mDate":(\w|\W)*}
回答by acdcjunior
The following regex should work:
以下正则表达式应该有效：
\{\s*"mTitle"\s*:\s*(.+?)\s*,\s*"mPoster":\s*(.+?)\s*,\s*"mYear"\s*:\s*(.+?)\s*,\s*"mDate"\s*:\s*(.+?)\s*\}
The main difference from your regex is the .+?part, that, broken down, means:
与您的正则表达式的主要区别在于.+?部分，分解后意味着：
- Match any character (
.) - One or more times (
+) - As little as possible (
?)
- 匹配任何字符 (
.) - 一次或多次 (
+) - 尽量少（
?）
The ?operator after the +is very important here --- because if you removed it, the first .+(in \{\s*"mTitle"\s*:\s*(.+?)) would match the whole text, notthe text up to the "mPoster"word, that is what you want.
该?操作后，+在这里非常重要---因为如果你删除它，第一个.+（在\{\s*"mTitle"\s*:\s*(.+?)）将匹配整个文本，没有文本到"mPoster"的话，那就是你想要的。
Notice it is just a more complicated version of \{"mTitle":(.+?),"mPoster":(.+?),"mYear":(.+?),"mDate":(.+?)\}(with \s*to match spaces, allowed by the JSON notation).
请注意，它只是一个更复杂的版本\{"mTitle":(.+?),"mPoster":(.+?),"mYear":(.+?),"mDate":(.+?)\}（\s*用于匹配空格，JSON 表示法允许）。
