'(TEST1 = 111 OR TEST1 = 222) AND (RAZ = 'Тип емкости') AND (BIZ_D = 24.7) AND (DATER = '01.01.2015')'

            String str = @"(TEST1 = 111 OR TEST1 = 222) AND (POST1 = 555)";
            String[] words = str.Split(new Char[] {' ', '(', ')'});
            for (Int32 i = 1; i < words.Length - 1; i++) {
                if (words[i].Equals("=")) Console.WriteLine("{0}={1}", words[i - 1], words[i + 1]);
            }

const string str = @"(TEST1 = 111 OR TEST1 = 222) AND (POST1 = 555)";
var rx = new Regex(@"\((.*?)\)");
var smt = rx.Matches(str)
     .OfType<Capture>()
     .Select(s => s.Value.Replace("(", "").Replace(")", "").Split(new[] {"OR", "="}, StringSplitOptions.None))
     .Select(s => new { key = s[0].Trim(), value = s })
     .Select(s => new { s.key, value = s.value.Where(w => !s.key.Trim().Contains(w.Trim())).Select(sm => sm.Trim()).ToArray() })
     .Select(s => new { s.key , s.value })
     .ToList();