Add endRegex group or last line folding index to Output

[TonyGravagno]

With an array of foldLastLine values, when the Output window shows a match we don't know which one of the groups matched.

I look at the regex, count the pipe delimeters, compare it to the foldLastLine array, and then look at folded code to see which one of the patterns matched to trigger the last line condition. Or I'll just change a couple of the likely booleans and watch to see if the fold changes.

It would be much more elegant if the output showed the index number of the matched group, and/or the regex of that group.

Related concepts not worth an Issue now but just discussion:

1. I don't think the documentation is clear that the 0th element of the foldLastLine prop is the default. So a match on group 0 = element 1 of the foldLastLine array.
2. If there are two regex groups, and three foldLastLine booleans, it works fine. If there is an extra boolean it no longer works. I don't have the code in front of me but this might be because the test for values uses the index from the count on the array of values and chokes when it can't find a group.
3. Now I also remember from the code for the recent change for a string/regex value for foldLastLine. It checks if that prop is an array and then assumes all values are boolean, as they should be. I don't think it checls to see if those array elements are actually boolean.

[daiyam]

Can you give an example (settings and code)? Thx