Alex Alex - 2 months ago 15
C# Question

DataAnnotations - Disallow Numbers, or only allow given strings

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

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/