Variable-length negative look-behind can be emulated using \K. The two regexes are almost identical, and can be abstracted in a variable. "@-" is shorter than "$-[0]". If using perl >= 5.14, /./ followed by "$& $'" can be replaced with s/./$& /r.
All in all, that's 30 characters easily chipped off. There’s still a lot of room for improvement—this next is hurting my eyes. I’ll probably look at it some more another day.
#!perl -ln0
$:='(.{9}|)\Kw|w(?=(.{9}|)';
map{$i="@-"+11;{map{1while
s/W$:W)/W/s;/ \U$: )/s||print($i=~s/./$& /r)+next}"$`W$'"while/w/g}}"$
+`x$'"while/ /g
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