In this article I will explain with an example, how to use multiple Regular Expression (Regex) Data Annotation attributes for validation in ASP.Net MVC Razor.
The validation will be performed on Client Side using Model class and multiple Regular Expression (Regex) Data Annotation attributes in ASP.Net MVC Razor.
 
 
Configuring Bundles and enabling Client Side Validation
Please refer the following article for complete information on how to configure Bundles and enable Client Side validation in ASP.Net MVC project.
Using Bundles (ScriptBundle) in ASP.Net MVC Razor
Note: By default the validation done using Data Annotation attributes is Server Side. And hence to make it work Client Side, the Client Side validation must be enabled.
 
 
Model
The following Model class consists of one property Amount. The property is decorated with the following Data Annotation attributes for performing validations.
1. Required Data Annotation attribute.
The Required Data Annotation attribute have been specified with a property Error Message with a string value. As the name suggests, this string value will be displayed to the user when the respective validation fails.
2. Custom RegularExpression Data Annotation attribute for Number (Digit).
The Custom RegularExpression Data Annotation attribute for digit accepts the Regular Expression as first parameter. The Regular expression will allow only Numbers (Digits).
3. Custom RegularExpression Data Annotation attribute for Period (Dot).
The Custom RegularExpression Data Annotation attribute for Period (Dot) accepts the Regular Expression as first parameter. The Regular expression will not allow only Period (Dot).
public class PersonModel
{
    [Required(ErrorMessage = "Required.")]
    [Number(ErrorMessage = "Only Number (Digit)")]
    [Period(ErrorMessage = "Dot (Period) not allowed.")]
    public string Amount { get; set; }
}
 
public class Number : RegularExpressionAttribute
{
    public Number()
        : base("^[0-9]*$")
    {
    }
}
 
public class Period : RegularExpressionAttribute
{
    public Period()
        : base("^[^\\.]*$")
    {
    }
}
 
 
Controller
The Controller consists of two Action methods.
Action method for handling GET operation
Inside this Action method, simply the View is returned.
 
Action method for handling POST operation
This action method handles the POST operation and when the form is submitted, the object of the PersonModel class is sent to this method.
public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public ActionResult Index(PersonModel person)
    {
        return View();
    }
}
 
 
View
Inside the View, in the very first line the PersonModel class is declared as Model for the View.
The View consists of an HTML Form which has been created using the Html.BeginForm method with the following parameters.
ActionName – Name of the Action. In this case the name is Index.
ControllerName – Name of the Controller. In this case the name is Home.
FormMethod – It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
Inside the View, the following two HTML Helper functions are used:-
1. Html.TextBoxFor – Creating a TextBox for the Model property.
2. Html.ValidationMessageFor – Displaying the Validation message for the property.
There is also Submit button which when clicked, the Form gets submitted.
The jQuery and the jQuery Validation script bundles are rendered at the end of the Model using the Scripts.Render function.
@model Multiple_Regex_Attribute_MVC.Models.PersonModel
 
@{
    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>
    @using (Html.BeginForm("Index", "Home", FormMethod.Post))
    {
        <table>
            <tr>
                <td>Amount</td>
                <td>@Html.TextBoxFor(m => m.Amount)</td>
                <td>@Html.ValidationMessageFor(m => m. Amount, "", new { @class = "error" })</td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value="Submit"/></td>
                <td></td>
            </tr>
        </table>
    }
</body>
@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/jqueryval")
</html>
 
 
Screenshot
Using Multiple Regular Expression (Regex) Data Annotation attributes in ASP.Net MVC
 
 
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