问题
I'm looking for regex to extract json string from text. I have the text below, which contains
JSON string(mTitle, mPoster, mYear, mDate)
like that:
{"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.
I've tried this regular expression with no success:
{"mTitle":(\w|\W)*"mDate":(\w|\W)*}
回答1:
The following regex should work:
\{\s*"mTitle"\s*:\s*(.+?)\s*,\s*"mPoster":\s*(.+?)\s*,\s*"mYear"\s*:\s*(.+?)\s*,\s*"mDate"\s*:\s*(.+?)\s*\}
Check demo here.
The main difference from your regex is the .+? part, that, broken down, means:
- Match any character (
.) - One or more times (
+) - As little as possible (
?)
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, not the text up to the "mPoster" word, that is what you want.
Notice it is just a more complicated version of \{"mTitle":(.+?),"mPoster":(.+?),"mYear":(.+?),"mDate":(.+?)\} (with \s* to match spaces, allowed by the JSON notation).
来源：https://stackoverflow.com/questions/20916699/regular-expression-to-extract-json-string-from-text