Validate A List Of String?

Data annotation to validate an inbound model in MVC:

public class ValidNumber
{
[RegularExpression(@"^d+$", ErrorMessage = "*")]
public string number { get; set; }
}

Would I need to create my own class to validate a List<string> or can I do something like this? What code could I write in C# to add a Regex validator for a list of string?

public class ValidNumberList
{
[RegularExpression(@"^d+$", ErrorMessage = "*")]
public List<string> numbers { get; set; }
}