validateEventForm method
String? validateEventForm (String value, String? label)
Implementation
static String? validateEventForm(String value, String? label) {
if (value.isEmpty) {
return '$label must not be left blank.';
}
// ignore: unnecessary_raw_strings
const String pattern = r'(?=.*?[A-Za-z]).+';
final RegExp regex = RegExp(pattern);
if (!regex.hasMatch(value)) {
return "Invalid $label";
}
return null;
}