RegularExpressionAttribute bug by Ludovic Dubois

Active

Type:	Bug
ID:	773530
Opened:	12/5/2012 4:42:39 AM
Access Restriction:	Public

Workaround(s)

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User(s) can reproduce this bug

Regular expression such as "^\S+$" does not work because "" succeed!

RegularExpressionAttribute.IsValid has a test string.IsNullOrEmpty(input)) return true; that is wrong. null is a special case, but empty should be used as a testable value.

Details (expand)

.NET Framework 4.5

have a class with this property

[RegularExpression("^\S$"]
public string Name {get;set;}

Then use Validator class to test if "" is valid for this proeprty => true instead of false!

English

Windows 7 SP1

English

succeed

fail

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Posted by Microsoft on 2/18/2013 at 10:33 AM

The Silverlight docs state this behavior (http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.regularexpressionattribute(v=VS.95).aspx) but the .NET full docs do not (http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.regularexpressionattribute(v=vs.110).aspx). We plan to update the documentation to match.

Posted by Microsoft on 12/6/2012 at 12:18 AM

Thanks for your feedback.

We are rerouting this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.

Posted by Microsoft on 12/5/2012 at 4:50 AM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)

Posted by Ludovic Dubois on 12/5/2012 at 2:41 PM

I added [Required], but it seems it does not make sense since I specify twice I need data!

Microsoft