format method

String format(
  1. String cnpj
)

Implementation

String format(String cnpj) {
  RegExp regExp = RegExp(r'^(\d{2})(\d{3})(\d{3})(\d{4})(\d{2})');

  return cnpj.replaceAllMapped(
      regExp, (Match m) => "${m[1]}.${m[2]}.${m[3]}/${m[4]}-${m[5]}");
}