ktsirig

Hi all!

I have a string :

$seq="IIIIIMMMMMMMMMMMOOOOOOOOOOOOOOOOMMMMMMMMMMMMMIIIIIMMMMMMMMMOOOOOOOOOOOOOOMMMMMMMMMMMMMIIIMMMMMMMMMMMOOOOOOOOOOOOOOOMMMMMMMMMMMIIIIIIMMMMMMMMMMMMMOOOOOOOOOOOOOOOOOOOOOOOMMMMMMMIIIMMMMMMMMMOOOOOOOOOOOOOOOOOOOOOOOOOOOMMMMMMMIIIIMMMMMMMMMMMOOOOOOOOOOOOOOOOOOOOOMMMMMMMIIIMMMMMMMMMOOOOOOOOOOOOOOOOOOOOOOOOOMMMMMMMMMIIIMMMMMMMMMMMOOOOOOOOOOOOOOOOOMMMMMMMMI";

and I want to find all groups of MMMMMM. I don't want to find only every position in the string that has 'M',
i.e. pos6, pos7, pos8, pos9 etc but I want to have something like:

1st group : pos 7-15
2nd group : pos 23-34
3rd group : pos 45-55

etc