oneUpperCase static method

ValidationRule oneUpperCase({
  1. String message = 'Must contain at least one uppercase letter',
})

Implementation

static ValidationRule oneUpperCase({
  String message = 'Must contain at least one uppercase letter',
}) {
  return ValidationRule(
    (value) => RegExp(r'[A-Z]').hasMatch(value ?? '') ? null : '',
    message,
  );
}