Indonesian Strict Phone TextField

import 'package:flutter/widgets.dart';
import 'package:flutter/services.dart';

final regex = RegExp(
  r"(^\+)|((?<=^\+)6)|((?<=^\+6)2)|((?<=^\+62)8)|((?<=^\+628\d*)\d)|(^0)|((?<=^0)8)|((?<=^08\d*)\d)",
);

final idStrictTextField = TextField(
  inputFormatters: [
    LengthLimitingTextInputFormatter(
      16,
      maxLengthEnforcement: MaxLengthEnforcement.enforced,
    ),
    FilteringTextInputFormatter.allow(regex,),
  ],
);