I might have completely missed the point, but may the following
help?
GRASS> g.mlist type=rast pattern="prefix*" \
| (while read r; do r.region map="$r" ...; done)
(I'm assumed that you've ran into a limit of command line
length; since the above loop doesn't try to put all the map
names into a single command, but rather issues a separate
command for each of the maps, it should overcome the limit.)
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