A repeat inside a regexp group gives back to what follows the group

On aab, /a+ab/ matched but /(a+)ab/ and /(a*)ab/ missed, and so did
(.+)_area and ([a-z_]+)_area, in addr, Edit and look alike. mvzr's hasAlt
counts a group's own ) as an alternative, so every group with pattern after
it takes matchGroup's alternatives branch, which never tries a repeat's
shorter matches. No newer mvzr fixes it (trunk is the pinned commit), so
the build patches the fetched source as it does the step budget,
anchor-checked: when the rest fails after a group, the group's shorter
matches are tried, longest first. docs/mvzr-group-backtrack.md is a report
for upstream.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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