<regex>: Remove nodes for capturing group 0 from the NFA #6025
Description
Recent versions of the matcher skip the NFA nodes of type _N_capture and _N_end_capture for storing the start and end iterators of capturing group 0. We should remove these nodes from the NFA.
This change will have to wait until vNext because old versions of the matcher do use the _N_capture node to compute capturing group 0.
vNext note: Resolving this issue will require breaking binary compatibility. We won't be able to accept pull requests for this issue until the vNext branch is available. See #169 for more information.