isLength function

bool isLength (String input, int min, [ int max ])

check if the length of the string input falls in a range

Implementation

bool isLength(String input, int min, [int max]) {
  List surrogatePairs = _regExp.allMatches(input).toList();
  int len = input.length - surrogatePairs.length;
  return len >= min && (max == null || len <= max);
}