removeSurroundingQuotes method
Removes quotes (single or double) surrounding a value.
Implementation
String removeSurroundingQuotes(String val) {
  if (!_surroundQuotes.hasMatch(val)) {
    return removeCommentsFromLine(val, includeQuotes: true).trim();
  }
  return _surroundQuotes.firstMatch(val)!.group(2)!;
}