pan static method

String? pan(
  1. String? value
)

Implementation

static String? pan(String? value) {
  if (value == null || value.isEmpty) return null;

  final regex = RegExp(r'^[A-Z]{5}[0-9]{4}[A-Z]{1}$');
  if (!regex.hasMatch(value)) {
    return "Invalid PAN Number";
  }
  return null;
}