Thanks Pooja for the reply.  The reason is because we need to concatenate a calculated field with some text to display in a view.  When doing this, the formatting set on the calculated field is not preserved.  Therefore, we need to apply the commas as needed.  Attached is a totally made up example to get the point across.  I know in other applications you can use Regular Express Replace functions to do this.  And I've tried applying patterns that should do this, but nothing seems to work.  Again, probably a lack of my knowledge of RegEx.

Thank you Pooja for the suggestion.  However, that is not the use case we have and we need to do it the way I've described.

Thank you so much.  I will take the time to look at the suggested link to help me understand better.  While this solves the problem at hand, there is one thing I noticed.  If the value is not a whole number, but rather something like 1234.56, it produces a result like 1,234.5,599,999,999,999.  Any ideas as to why this is occurring.