I've got the following code. The idea is to convert an array representing a bitmap to a string representing the range of that bitmap. So, (1,1,0,1,1,1,0) would convert to "0-1,3-5". (In my code, I'm converting from 0-base to 1-base using the map.) 
my @channels = (1, 1, 0, 1, 1, 1, 0);
my $val = join ',', map { $_ + 1 } grep { $channels[$_] } 0 .. $#chann
+els;

$val =~ s/(\d+),(\d+)/$1+1 == $2 ? "$1-$2" : "$1,$2"/eg;

print $val, $/;

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Unfortunately, the regex only works if my set-bits are only in pairs. If I put the triple 1,1,1 (as above), it only works for the first pair. In addition, (1,1,1,0,1,1,0) converts to "1-2,3,5,6", which totally boggles me.

Help?

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In reply to Question on s///eg by dragonchild

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