I want to extract the value 0.81 from the following string, but I don't know how. Using JSON doesn't work, because as far as I know it's not proper JSON code.
[{"boundingbox":{"size":{"height":239.23,"width":239.23},"tl":{"y":46.15,"x":166.92}},"name":"152:0.81,","confidence":0.9}]
Do you have any idea how to do that?
If this is JSON, which it appears to be, load it up as a JSON Object and
JSONArray jsonArray = new JSONArray(thatString);
JSONObject jObj = jsonArray.getJSONObject(0);
String name = jObj.getString("name");
Which would then give you a string "152:0.81,", an odd name - however I would then split it:
String[] tokens = name.split(":");
tokens[0] will be 152
tokens[1] will be 0.81,
It actually is valid Json, so you could use Json library (any of them), to load the Json to an Object and access the value - If you're having problems loading this into an Object, perhaps you can change your question and show us the error?
If, by any chance, you might get a response that isn't valid Json, you might use a regex:
If you always have that same pattern, something like:
\"name\":\"\d+:(\d\.\d+),\"
Your value will be in capturing group one.
If you're not sure how to use regexes in Java, just search SO or Google, there's a ton of examples.
0.81is not a value of its own. You need to get the value of "name", split it on ":", an take the second part of the split result. Should be a nice exercise so I am not gonna give a working answer.