isFullDomainName static method

bool isFullDomainName(
  1. String str, {
  2. bool requireTld = true,
  3. bool allowUnderscores = false,
})

Implementation

static bool isFullDomainName(
  String str, {
  bool requireTld = true,
  bool allowUnderscores = false,
}) {
  var parts = str.split('.');
  if (requireTld) {
    var tld = parts.removeLast();
    if (parts.isEmpty || !RegExp(r'^[a-z]{2,}$').hasMatch(tld)) {
      return false;
    }
  }

  for (var part in parts) {
    if (allowUnderscores) {
      if (part.contains('__')) {
        return false;
      }
    }
    if (!RegExp(r'^[a-z\\u00a1-\\uffff\d-]+$').hasMatch(part)) {
      return false;
    }
    if (part[0] == '-' || part[part.length - 1] == '-' || part.contains('---')) {
      return false;
    }
  }
  return true;
}