String decoded = Pattern.compile("\\\\u([0-9a-fA-F]4)") .matcher(input) .replaceAll(mr -> String.valueOf((char) Integer.parseInt(mr.group(1), 16)));
Program
Or without libraries (Java 13+):
A serves two primary purposes for software engineers: reverse engineering compiled Java bytecode ( .class or .jar files) back into human-readable source code, and decoding data formats like Base64, hex, or URL strings using Java-based utilities. java decoder online
Some advanced decoders also handle (e.g., Base64 inside Unicode escapes). String decoded = Pattern