Java string – regex replace for pattern

I’ve a json string. I would like to replace all instances of:

...
...
"style":[["1","2"]]
...
"style":["1"]
...
"style":[["1","3","5","8"]]

to:

...
...
"style":["1","2"]
...
"style":["1"]
...
"style":["1","3","5","8"]

How can I do it?

>Solution :

For best results, you should probably use a JSON parser. If all style keys would always be either singly or doubly nested arrays of strings, then a regex replace all might be sufficient:

String input = "\"style\":[[\"1\",\"3\",\"5\",\"8\"]]";
String output = input.replaceAll("\"style\":\\s*\\[\\[(.*?)\\]\\]", "\"style\":[$1]");
System.out.println(output);  // "style":["1","3","5","8"]