Check if character is letter in Delphi (Unicode)

On Rad Studio XE4 I am told that TCharacter is deprecated and to use System.Character.TCharHelper instead. It is a record helper that extends type Char with functions in method syntax. This means that I now add System.Character to my uses list and can then call e.g. C.IsLetterOrDigit where C is of type Char.

Try using the Character.TCharacter.IsLetter or Character.IsLetter functions