validate method
Validates the provided data against this rule.
Returns true if the data is valid, false otherwise.
Subclasses must implement this method.
Implementation
@override
bool validate(data) {
RegExp regExp = RegExp(
r'^\(?(\d{3})\)?[-\. ]?(\d{3})[-\. ]?(\d{4})( x\d{4})?$',
);
return regExp.hasMatch(data.toString());
}