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;
}