separateCharacters method

String separateCharacters(
  1. int number,
  2. String separator
)

Implementation

String separateCharacters(final int number, final String separator) => replaceAllMapped(
      RegExp('(\\d{1,$number})(?=(\\d{$number})+(?!\\d))'),
      (final Match m) => '${m[1]}$separator',
    );