the refs that match the <pattern>.
gc.reflogExpireUnreachable::
-gc.<ref>.reflogExpireUnreachable::
+gc.<pattern>.reflogExpireUnreachable::
'git reflog expire' removes reflog entries older than
this time and are not reachable from the current tip;
defaults to 30 days. With "<pattern>" (e.g. "refs/stash")