[V8i] Pen Table Text Substitutions

Hello all,

I'm trying to create a text substitution that will insert a range of characters from the file name.

For example, I have a dgn named 123_plan.dgn.

My border contains the text $DGNNUMBER$

I have defined a text substitution in my pen table as follows:

Actual                         Replacement

$DGNNUMBER$        _FILES_

The result, of course, is that if I print 123_plan.dgn with this pen table, I get "123_plan.dgn" in my border in place of "$DGNNUMBER$".

What I'd like to do, is modify the replacement to only part of the filename. What would I need to do in order for the replacement to show "123" instead of "123_plan.dgn"?

Thank you.