toFormattedString function

String toFormattedString(
  1. String iban, [
  2. String separator = " "
])

Implementation

String toFormattedString(String iban, [String separator = " "]) {
  return iban
      .replaceAllMapped(
          RegExp("(.{4})"), (match) => "${match.group(1)}$separator")
      .trim();
}