MVC Validation make RegularExpression numeric only on string field

Question

I have the following property in my view model:

[Required]
[MaxLength(12)]
[MinLength(1)]
[RegularExpression(\"[^0-9]\", ErrorMessage = \"UPRN must be numeri         


        

Answer 1

Or you could do the length validation in the regexp:

[Required]
[RegularExpression("^[0-9]{1,12}$", ErrorMessage = "...")]
public string Uprn { get; set; }

Here's the regex visualized:

Debuggex Demo

Answer 2

I suggest you use either:

[RegularExpression("\d*", ErrorMessage = "UPRN must be numeric")]

*note that it will accept empty if you remove [Required] and [MinLength(1)]

or use the following:

[RegularExpression("\d+", ErrorMessage = "UPRN must be numeric")]

which will only accept one more digits

you can test your regular expressions here: https://regex101.com/

Answer 3

The RegEx should be ^[0-9]*$.

I.E.

The property should look like:

[Required]
[MaxLength(12)]
[MinLength(1)]
[RegularExpression("^[0-9]*$", ErrorMessage = "UPRN must be numeric")]
public string Uprn { get; set; }

See working example.

---

I'm sure you already have jQuery referenced but make sure jQuery validate and Microsoft validate scripts are included.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>

<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>

Answer 4

The regular expression is wrong. Replace it with:

[Required]
[MaxLength(12)]
[MinLength(1)]
[RegularExpression("^[0-9]*$", ErrorMessage = "UPRN must be numeric")]
public string Uprn { get; set; }    

Don't forget to include:

@Scripts.Render("~/bundles/jqueryval")

in your view for the jquery validation