tryValidate method

@override String? tryValidate()

Validates the form field value

Implementation

@override
String? tryValidate() {
  RegExp exp = RegExp(
      r"^(?!0)(?!.*\.$)((1?\d?\d|25[0-5]|2[0-4]\d)(\.|$)){4}$",
      caseSensitive: false,
      multiLine: false);
  if (!exp.hasMatch(value)) {
    if (customMessage == null) {
      return buildMessage(ValidatorStrings.ip, attribute);
    }
    return customMessage;
  }
  return null;
}