A RussianLetterTokenizer is a tokenizer that extends LetterTokenizer by additionally looking up letters in a given "russian charset". The problem with LeterTokenizer is that it uses Character.isLetter() method, which doesn't know how to detect letters in encodings like CP1252 and KOI8 (well-known problems with 0xD7 and 0xF7 chars)

public class RussianLetterTokenizer : CharTokenizer

Public Class RussianLetterTokenizer _
	Inherits CharTokenizer

public ref class RussianLetterTokenizer : public CharTokenizer