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  1. or download this
    s/(.)(\.+)/$1 x (1+length $2)/seg;
  2. or download this
    $ perl -wle'
    $_ = "III...MMMMMOOOO....MMMIIIII";
...
'
III...MMMMMOOOO....MMMIIIII
IIIIIIMMMMMOOOOOOOOMMMIIIII
  3. or download this
    $ perl -wle'
    $_ = "III...MMMMMOOOO....MMMIIIII";
...
'
III...MMMMMOOOO....MMMIIIII
IIIIIIMMMMMOOOOOOOOMMMIIIII