RegularExpressionAttribute Class

When you apply this attribute to a data field, you must follow the guidelines for the use of the validation attributes. For more information, see ASP.NET Dynamic Data Guidelines.

The following example shows how to use the RegularExpressionAttribute attribute to validate the FirstName and LastName data fields. The regular expression allows up to 40 uppercase and lowercase characters. The example performs the following tasks:

• Implements a metadata partial class and the associated metadata class.

• In the associated metadata class, applies the RegularExpressionAttribute attribute to the FirstName and LastName data fields, specifying the pattern and custom error messages.

using System;
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;


[MetadataType(typeof(CustomerMetaData))]
public partial class Customer
{


}

public class CustomerMetaData
{

    // Allow up to 40 uppercase and lowercase 
    // characters. Use custom error.
    [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$", 
         ErrorMessage = "Characters are not allowed.")]
    public object FirstName;

    // Allow up to 40 uppercase and lowercase 
    // characters. Use standard error.
    [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$")]
    public object LastName;
}

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference