Lucene.Net.Support.Character.IsLetter C# (CSharp) Метод

        public static bool IsLetter(int c)
        {
            var unicodeCategory = Char.GetUnicodeCategory((char)c);

            return unicodeCategory == UnicodeCategory.LowercaseLetter ||
                   unicodeCategory == UnicodeCategory.UppercaseLetter ||
                   unicodeCategory == UnicodeCategory.TitlecaseLetter ||
                   unicodeCategory == UnicodeCategory.ModifierLetter ||
                   unicodeCategory == UnicodeCategory.OtherLetter;
        }