Here's some not so thouroughly tested code: 
my @channels = (1, 1, 0, 1, 1, 1, 0);
my $str = join "", @channels;
my @range;
push @range, join "-", ($-[0], $+[0]-1) while $str =~ m/(1+)/g;
print join ",", @range;

[download]
prints 0-1,3-5

/prakash

Update: I must add that this may not work for perl versions older than 5.6.0.

In reply to Re: Question on s///eg by PrakashK
in thread Question on s///eg by dragonchild

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