using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
String input = @"test (alpha)";
Regex rgx = new Regex(@"(?<=\()[^()]*(?=\))");
foreach (Match m in rgx.Matches(input))
Console.WriteLine(m.Groups[0].Value);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CiAKcHVibGljIGNsYXNzIFRlc3QKewpwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCnsKIAogClN0cmluZyBpbnB1dCA9IEAidGVzdCAoYWxwaGEpIjsKIApSZWdleCByZ3ggPSBuZXcgUmVnZXgoQCIoPzw9XCgpW14oKV0qKD89XCkpIik7CiAKZm9yZWFjaCAoTWF0Y2ggbSBpbiByZ3guTWF0Y2hlcyhpbnB1dCkpCkNvbnNvbGUuV3JpdGVMaW5lKG0uR3JvdXBzWzBdLlZhbHVlKTsKIAp9Cn0=