validateValue method
Validates the value.
Returns null
if the value is valid, otherwise an error message.
Call validate() instead of this method when using the validator.
Implementation
@override
String? validateValue(String valueCandidate) {
final String phoneNumber = valueCandidate
.replaceAll(' ', '')
.replaceAll('-', '');
if (!regex.hasMatch(phoneNumber)) {
return errorText;
}
return null;
}