using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var test = "/abcd1/ef/gh001/d";
test = Regex.Replace(test, @"(?<=abcd)\d+", "");
Console.WriteLine(test);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgpwdWJsaWMgY2xhc3MgVGVzdAp7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCgl7CgkJdmFyIHRlc3QgPSAiL2FiY2QxL2VmL2doMDAxL2QiOwoJCXRlc3QgPSBSZWdleC5SZXBsYWNlKHRlc3QsIEAiKD88PWFiY2QpXGQrIiwgIiIpOwoJCUNvbnNvbGUuV3JpdGVMaW5lKHRlc3QpOwoJfQp9