How Do I embed a RegEx in a Report Model

I am having trouble figuring out how to create a new expression-based field in a report model that relies upon the result of a regular expression. It looks like I cannot make calls to static methods in the .NET in a report model. Correct?

Here is my attempt at the expression I want:
=IF((System.Text.RegularExpressions.Regex.IsMatch(PreferedEmail)),True,False)

The error returned when I attempt to save the expression in Report Model Designer is "The following is character is not valid: ."

BTW, the message is copied verbatim. The poor grammer is not my fault.
I take it that no news is very bad news on this front. There is no way to reference a static .NET method/object in a Report Model expression. That's a real shame.
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Kevin,

You can use regular expression in reporting services for example:

=System.Text.RegularExpressions.Regex.Replace(Fields!Phone.Value, "(\d{3})[ -.]*(\d{3})[ -.]*(\d{4})", "($1) $2-$3")

Hammer

|||I'm going to go out on a limb here & guess that you've never tried that in a Report Model (SDML). You absolutely can do that in an expression embedded in a Report Definition (RDL). But the Report Model Designer will not allow you to save the expression.|||

You are correct -- referencing .NET methods from a report model expression is not supported. Depending on the report the user creates, report model expressions can potentially end up translated into SQL or MDX and embedded deep in some database query.

If you have VS and you're just using the expression as a surface expression in a particular report, you might save your report out as a file, load it up in Report Designer, and then add the expression there. I realize this doesn't give you anything in the model, however.

|||It's not the answer I wanted but now I understand why I can't have what I want. Thanks for the explanation.