One way: 
use strict;
use warnings;

my $str="-----MMMMM------IIIII----MMM---OOOO---I---MMMM-----";
my @my_splitted_str=split(//,$str);

# add a sentinel value after the other characters, so
# the end of the last range is properly detected
push @my_splitted_str, "-";

my $range = ""; # we are not initially in a range
my $start_of_range;

for my $index ( 0 .. $#my_splitted_str ) {
    # if we are in a range, see if it ends now
    if ( $range && $range ne $my_splitted_str[$index] ) {
        # the previous character was the last of this range
        my $end_of_range = $index - 1;
        if ($end_of_range == $start_of_range) {
            print $start_of_range + 1, ":", $range, "\n";
        }
        else {
            print $start_of_range + 1, "-", $end_of_range + 1, ":", $r
+ange, "\n";
        }
        $range = "";
    }

    # see if this is the start of a range
    if (! $range && $my_splitted_str[$index] ne "-") {
        $start_of_range = $index;
        $range = $my_splitted_str[$index];
    } 
}

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Online Fortune Cookie Search

In reply to Re^2: group things? by ysth
in thread group things? by Anonymous Monk

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