Split String based on {} open and curly braces java

Question

I have a String like this

String str = {"name":"SachText_singleLineText","value":"text project field"},{"name":"SachSlistSingle_singleSelect","value":"s1"},{"name":"SachYesno_boolean","value":["1"]}

I need to split it based on curly braces like this

[0] = {"name":"SachText_singleLineText","value":"text project field"}
[1] = {"name":"SachSlistSingle_singleSelect","value":"s1"}
[2] = {"name":"SachYesno_boolean","value":["1"]}

Currently, this is what I am trying to do

String[] projectfieldsValueArray = str.split("\\{\\{,\\}\\}");

I tried with several combinations from net but still not able to split to my requirement. Need help on proper regex need to be used in this scenario.

Answer 1

you can try with Pattern Matcher.

    String key = "(\\{.*?\\})";
    String str = //your string.;
    Pattern pattern = Pattern.compile(key);
    Matcher matcher = pattern.matcher(str);
    if (matcher.find())
    {
        System.out.println(matcher.group(0));
    }

Answer 2

Using regex is going to be very hard to get it working. Consider this string:

{"name":"{SachText},{singleLineText}","value":"text project field"},{"name":"{SachSlist},{Single_singleSelect}","value":"s1"}

There are substrings of "},{" inside quotes, making them part of the name itself, so you don't want to split those.

Your strings look like elements of a JSON array. Therefore, put them between "[" and "]" and use a JSON parser, such as Jackson, GSon or Moshi, and it will parse them properly.

Answer 3

I am assuming ur string could be

String str = "{\"name\":\"SachText_singleLineText\",\"value\":\"text project field\"},{\"name\":\"SachSlistSingle_singleSelect\",\"value\":\"s1\"},{\"name\":\"SachYesno_boolean\",\"value\":[\"1\"]}";

If you need a String in between braces please use regex [{}] if you need a split string with braces you can prepend "{" and append "}"

 String[] arrOfStr = str.split("[{}]");
        for(String a: arrOfStr) {
            System.out.println(  a );
        }

O/p: "name":"SachText_singleLineText","value":"text project field", "name":"SachSlistSingle_singleSelect","value":"s1", "name":"SachYesno_boolean","value":["1"]

Answer 4

With str taken from Suvarn Banarjee and the hint from Mark Rotteveel:

String str = "{\"name\":\"SachText_singleLineText\",\"value\":\"text project field\"},{\"name\":\"SachSlistSingle_singleSelect\",\"value\":\"s1\"},{\"name\":\"SachYesno_boolean\",\"value\":[\"1\"]}";
String[] parts = str.split("(?<=\\}),(?=\\{)");

But again, this looks like JSON to me, so it's usually best to use a JSON library, since I'm pretty sure you're not done with just splitting.