isInValidArgument function

bool isInValidArgument(
  1. String value
)

Returns true when value does NOT match the required argument format — lowercase, starting with a letter, only letters/numbers/underscores — i.e. when it's invalid.

Implementation

bool isInValidArgument(String value) {
  final RegExp regex = RegExp(r'^[a-z][a-z0-9_]*$');
  return !regex.hasMatch(value);
}