Basically I am trying to force a name input format as follows:

Last Name, First Name MI (if applicable)

So here is my defined Regular Expression:

[A-Z]{1,20}[,][ ][A-Z]{1,20}[ ]{0,1}[A-Z]{0,2}[.]{0,1}

I know its crazy long but I want to force the "," and " " between the first and last names, but allow the person not to enter a middle initial if they do not have one.  If they do enter a middle initial then there needs to be a space after the "first name" and then 1 or 2 characters followed by a ".".

Here's my dilemma:  I am trying to use a "Default Value" of "Not, defined".  Which is a valid entry.  It follows the format above in the Regular Expression and passes the test, but I get an error in the screen when it displays the default value.  Does "Default Value" put something in the HTML string that I cannot see and therefore it fails??