split function

List<String> split(String str, [ List<String>? splitter ])

Splits a string based on the specified character and returns it as an Array. Unlike the existing split, it splits the values provided as multiple parameters (array or multiple arguments) at once.

Implementation

List<String> split(String str, [List<String>? splitter]) {
  if (str.isEmpty) {
    return [];
  }

  final List<String> splitters =
      (splitter != null && splitter.isNotEmpty) ? splitter : [];

  if (splitters.isEmpty) {
    return [str];
  }

  final int splitterLength = splitters.length;
  String charPattern = '';
  String strPattern = '';

  for (var i = 0; i < splitterLength; i++) {
    final String spl = splitters[i];

    if (spl.length > 1) {
      final String escaped = spl
          .replaceAll(r'\', r'\\')
          .replaceAll('[', r'\[')
          .replaceAll(']', r'\]')
          .replaceAll('?', r'\?')
          .replaceAll('.', r'\.')
          .replaceAll('{', r'\{')
          .replaceAll('}', r'\}')
          .replaceAll('+', r'\+');
      strPattern += '${strPattern.isEmpty ? '' : '|'}$escaped';
    } else if (spl == '-' || spl == '[' || spl == ']') {
      charPattern += r'\' + spl;
    } else {
      charPattern += spl;
    }
  }

  if (charPattern.isEmpty && strPattern.isEmpty) {
    return [str];
  }

  if (charPattern.isNotEmpty) {
    charPattern = '[$charPattern]';
    if (strPattern.isNotEmpty) {
      strPattern = '|$strPattern';
    }
  }

  return str.split(RegExp('$charPattern$strPattern+', caseSensitive: false));
}