using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string lista = "RUASANTA HELENA, 769 AP 51 BL H JD ALVORADA~ 17513322 ";
var texto = Regex.Replace(lista, @"([\d]+)(?=\s+)", "$1~");
System.Console.Write(texto);
}
}
dXNpbmcgU3lzdGVtLlRleHQuUmVndWxhckV4cHJlc3Npb25zOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoJCXN0cmluZyBsaXN0YSA9ICJSVUFTQU5UQSBIRUxFTkEsIDc2OSAgQVAgNTEgQkwgSCBKRCBBTFZPUkFEQX4gMTc1MTMzMjIgIjsKCQkKCQl2YXIgdGV4dG8gPSBSZWdleC5SZXBsYWNlKGxpc3RhLCBAIihbXGRdKykoPz1ccyspIiwgIiQxfiIpOwoJCQoJCVN5c3RlbS5Db25zb2xlLldyaXRlKHRleHRvKTsKCX0KfQ==