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.
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
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.
