Dart

Decode 2-digit Hex Escaped

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Demonstrates how to replace escaped us-ascii chars such as \x7b and \x22 with the chars. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // We have the following string with some us-ascii chars escaped like this:
  final s = '\x7b\x22responseContext\x22:\x7b\x22';

  // Note: The above escaping does not conform to any standard format (as far as I know).
  // Chilkat does not have anything to decode from the above.
  // However, we can 1st transform into a standard format, and then decode..

  // JSON escapes chars outside us-ascii like this:  "Hello, \ud83d\ude03!"
  // We can transform the above to this:  "\u007b\u0022responseContext\u0022:\u007b\u0022"
  // And then decode..

  final sb = CkStringBuilder();

  sb.append(s);
  final numReplaced = sb.replace('\\x', '\\u00');

  // Now decode from "json" escapes
  sb.decode('json', 'utf-8');

  // Show the decoded string
  print(sb.getAsString());

  // Here's the result: {"responseContext":{"
}