BinaryFileSchemaParser.BinaryFileSchemaParser.valid_item_name C# (CSharp) Метод

        public bool valid_item_name()
        {
            return And(()=>
                     (In('a','z', 'A','Z')||OneOf("_"))
                  && OptRepeat(()=>
                      (In('a','z', 'A','Z', '0','9')||OneOf("_")) ) );
        }