using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
Regex re = new Regex("[.?!]*(?=[.?!]$)");
Console.WriteLine(re.Replace("This is a string....!", ""));
Console.WriteLine(re.Replace("his is another...!!", ""));
Console.WriteLine(re.Replace("What is this..!?!?", ""));
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgpwdWJsaWMgY2xhc3MgVGVzdAp7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCgl7CgkJUmVnZXggcmUgPSBuZXcgUmVnZXgoIlsuPyFdKig/PVsuPyFdJCkiKTsKCQlDb25zb2xlLldyaXRlTGluZShyZS5SZXBsYWNlKCJUaGlzIGlzIGEgc3RyaW5nLi4uLiEiLCAiIikpOwoJCUNvbnNvbGUuV3JpdGVMaW5lKHJlLlJlcGxhY2UoImhpcyBpcyBhbm90aGVyLi4uISEiLCAiIikpOwoJCUNvbnNvbGUuV3JpdGVMaW5lKHJlLlJlcGxhY2UoIldoYXQgaXMgdGhpcy4uIT8hPyIsICIiKSk7Cgl9Cn0=