DataAnnotations - Disallow Numbers, or only allow given strings

c# asp.net-mvc validation asp.net-mvc-2 data-annotations
Alex picture Alex · May 28, 2010 · Viewed 18.1k times · Source

Is it possible to use ASP.NET MVC 2's DataAnnotations to only allow characters (no number), or even provide a whitelist of allowed strings? Example?

Answer

Marc Tidd picture Marc Tidd · May 28, 2010

Use the RegularExpressionAttribute.

Something like

[RegularExpression("^[a-zA-Z ]*$")]

would match a-z upper and lower case and spaces.

A white list would look something like

[RegularExpression("white|list")]

which should only allow "white" and "list"

[RegularExpression("^\D*$")]

\D represents non numeric characters so the above should allow a string with anything but 0-9.

Regular expressions are tricky but there are some helpful testing tools online like: http://gskinner.com/RegExr/

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