Validating Method Parameters

[dreckner]

I have a static method on a ReadOnlyList that takes a string as a parameter. The search string accepts a full name, email address, transaction number, a transaction number range, a single date and a date range. What is the best way to protect the parameter from unexpected characters?

[GreatBarrier86]

Given that Microsoft's own code throws the ArgumentNullException where appropriate, I'd imagine that just validating the parameters with either a String.Contains or Regex.IsMatch would be a reasonable implementation.

In principle, that would probably be similar to the logic that would satisfy this design warning here