Extract only the values from a JSON string using Regular Expressions

Question

Extract only the values from a JSON string using Regular Expressions

Need help cutting out specific values from a JSON String in Flutter/Dart.

Here's an example of the JSON String:

  [{"insert":"Test12\n"},{"insert":"Test1","attributes":{"b":true}},{"insert":"\nTest"},{"insert":"\n","attributes":{"block":"quote"}},{"insert":"Test","attributes":{"s":true}},{"insert":"\nTest"},{"insert":"\n","attributes":{"block":"ol"}},{"insert":"Test"},{"insert":"\n","attributes":{"block":"ol"}},{"insert":"Test"},{"insert":"\n","attributes":{"block":"ul"}},{"insert":{"_type":"hr","_inline":false}},{"insert":"\n"},{"insert":"Test","attributes":{"i":true,"u":true,"s":true,"b":true}},{"insert":"\n\n"}]

The goal is to extract only the values after the "insert" key. Thus, the desired result should be:

Test12 Test1 Test Test Test Test Test Test

Characters like "", . {} \n are not needed.

The term "Test" can represent various strings.

I've tried using RegEx but haven't been successful. Is RegEx the right approach for this task?

Thank you in advance.

json regex flutter

Answer 1

Answer №1

If you have some JSON data, it's a good idea to decode it like this:

var jsonData =  '[{"name":"John"},{"age":30}]';
jsonData = jsonData.replaceAll('\n', '\\n');
// Using jsonDecode() will convert the JSON into primitive objects.
var decodedData = jsonDecode(jsonData) as List<dynamic>;
var names = [ for(var item in decodedData) item["name"]];
for(var name in names)
  print(name);

Answer 2

If you have some JSON data, it's a good idea to decode it like this:

var jsonData =  '[{"name":"John"},{"age":30}]';
jsonData = jsonData.replaceAll('\n', '\\n');
// Using jsonDecode() will convert the JSON into primitive objects.
var decodedData = jsonDecode(jsonData) as List<dynamic>;
var names = [ for(var item in decodedData) item["name"]];
for(var name in names)
  print(name);

Extract only the values from a JSON string using Regular Expressions

Answer №1

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