Others seem to have interpreted this as "find all groups of one or more M's".
On the off chance that you actually meant 6 or more M's, try this
modification of japhy's solution:
my $seq = "...";
my @groups;
push @groups, [$-[0], $+[0]-1] while $seq =~ /M{6,}/g;
print "$_->[0] to $_->[1]\n" for @groups;
(where the displayed positions are 0-based.)
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