C# - Strong Password Regular Expression

^(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[~!@#$%^&*_+=[{\]};:<>|.?,-]).{6,20}$

var hasMatchPasswordRegex = new Regex(service.GetGlobalSetUp().Rows[0]["password_regex"].ToString());             if (!hasMatchPasswordRegex.IsMatch(change_password.NEW_PASSWORD))             {                 response.status = HttpStatusCode.InternalServerError;                 response.statusText = " <strong>Fail</strong>"+ service.GetGlobalSetUp().Rows[0]["password_mis_match_message"].ToString();                 var resultOutput = JsonConvert.SerializeObject(response, Formatting.Indented,                       new JsonSerializerSettings                       {                           ReferenceLoopHandling = ReferenceLoopHandling.Ignore                       });                 return Json(resultOutput, JsonRequestBehavior.AllowGet);             }

<p>* Password should equal or greater than 6 characters </p> <p> * Password should contain At least one lower case letter.</p> <p> * Password should contain At least one upper case letter.</p> <p> * Password should contain At least one numeric value.</p> <p>* Password should contain At least one special case characters</p>