Hi pandeygolu420...,
Use the regular expression [0-9]{3}-[0-9]{3}-[0-9]{4}.
Model
public class PersonModel
{
[Display(Name = "Phone:")]
[Required(ErrorMessage = "Phone Number is required")]
[RegularExpression("^[0-9]{3}-[0-9]{3}-[0-9]{4}$", ErrorMessage = "Invalid Phone")]
public string PhoneNumber { get; set; }
}
Controller
public class HomeController : Controller
{
// GET: Home
public IActionResult Index()
{
return View();
}
[HttpPost]
public IActionResult Index(PersonModel person)
{
return View();
}
}
View
@model Phone_Validation_Core_MVC.Models.PersonModel
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<style type="text/css">
body { font-family: Arial; font-size: 10pt; }
.error { color: red; }
</style>
</head>
<body>
<form asp-action="Index" asp-controller="Home" method="post">
<label asp-for="PhoneNumber" class="control-label"></label>
<input asp-for="PhoneNumber" class="form-control" />
<span asp-validation-for="PhoneNumber" class="error"></span>
<br />
<input type="submit" value="Submit" />
</form>
</body>
</html>
Screenshot
