Regex all character after first position in Dart

I’m trying to achieve this J*** D** from John Doe string but my current code output is **** ***.
Here is my current code:

void main() {
  String txt = 'John Doe';
  String hideStr = txt.replaceAll(RegExp(r'\S'), '*');
  print(hideStr);
}

any suggestion?

>Solution :

You can use negative look behind to exclude the character at start and after white-space

void main() {
    String txt = 'John Doe';
    String hideStr = txt.replaceAll(RegExp(r'(?<!^|\s)[^\s]'), '*');
    print(hideStr);
}

Because "J" and "D" sit after start of text and a space, the regex won’t match it