Rolling over the match for a repeated/quantified group doesn't highlight the captured text range in the test string

[peterflynn]

1. Edit the regex /a(xyz)+b/ with test string axyzb
2. Mouse over the "$1 xyz" captured group in the match results

Result: nothing is highlighted in the sample string (the "axyzb")

Expected: "xyz" highlighted

This is a known limitation of the method used to find the captured text within the sample string. I think it can be fixed, but it will make the code a good deal more complicated...