Flutter TextField inputFormatters not wokring with my custom regex

I want to allow this kind of input to my text field:

123
*123#
*123*4#

so I created and tested RegExr website this regex:

\**\d+\**\d+\#?

but when i try to type nothing is typed in the text field

code of using:

     ...

     keyboardType = TextInputType.phone;

     // to allow digits with asterik and hash
     final regex = RegExp(r'\**\d+\**\d+\#?');

     inputFormatters = [FilteringTextInputFormatter.allow(regex)];

     return TextField(
      ...
      keyboardType: keyboardType,
      inputFormatters: inputFormatters,
     );