System Variable or Diesel Expression Question

[Anonymous]

I need to make a huge amount of sheets with match line and I wanted to know if I could use this expression:

%<\AcVar ctab \f "%tc1">%

and make it add or subtract a 1 from the number it outputs. 

My sheets are all named 1,2,3,4,etc

The match line would reference the sheet before it and after it.

Is there a Field System Variable or Diesel Expression to accomplish this?

Thank you!

[ronjonp · Accepted solution]

Quick test and %<\AcVar ctab>% + 1 works in the formula field.