问颤振中textformfield字段数据写入的Regex控制

EN

formatter = new MaskTextInputFormatter(
  mask: '##/##/####', 
  filter: { "#": RegExp(r'[0-9]') },
  type: MaskAutoCompletionType.lazy
)

validator = (value) {
    if (value == null || value.isEmpty) {
      return null;
    }
    final components = value.split("/");
    if (components.length == 3) {
      final day = int.tryParse(components[0]);
      final month = int.tryParse(components[1]);
      final year = int.tryParse(components[2]);
      if (day != null && month != null && year != null) {
        final date = DateTime(year, month, day);
        if (date.year == year && date.month == month && date.day == day) {
          return null;
        }
      }
    }
    return "wrong date";
  } 

TextFormField(
        controller: TextEditingController(),
        inputFormatters: [formatter],
        autocorrect: false,
        keyboardType: TextInputType.phone,
        autovalidateMode: AutovalidateMode.always,
        validator: validator
)