How do I get the repeating section current row number in a NAC form?

Here’s what the repeating section looks like:

The approach I went with is basically this:

1. Use the convertToString function to convert the repeating section to a string.
2. Use the replace function to remove everything after the current row from that string
3. Use the replace function to remove everything from that string except a specific character that should only be present in each row once.
4. Count the resulting string, which should correspond to the current row number.

"Preference " + 
convertToString(
	length(
		replace(replace(convertToString([Form].[Repeating section 1]),"(.*" + [Form].[Repeating section 1].[Current row].[GUIDLabel] + "\"}).*","$1"),".(?!UniqueRecord)","")
		)
	) 

The trick with step 2 is that you need some way to identify what the current row is amongst the whole repeating section. I found that using the newGuidAsString() function accomplishes this well, in that it creates a unique value in a row, that you can reference from within the CurrentRow context. To do this, I have a form rule that when a new row is added, will set a hidden short-text field using this formula: "UniqueRecord" + newGuidAsString()

I’m then able to use a regular expression to remove everything after the current row, using the value from the current row’s GUIDLabel field to actually identify where that cutoff is.  The reason for me putting “UniqueRecord” in the field is for step 3.

In step 3, I remove any character that isn’t followed by “UniqueRecord”, which should give me a string that I can count the length of. 

Let me know if there’s any questions on that. It would be handy if there was just a built in variable for the CurrentRow context that could be referenced.