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This doesn't have to be complicated. Split on * and before /, then check for /\^\d+$/:

my @units= split m#(?<=.)(?:(?=/)|\*)#, $units, -1; my %power; for my $unit ( @units ) { my $power= 1; if( $unit =~ s#\^(\d+)$## ) { $power= $1; } if( $unit =~ s#^/## ) { $power= -$power; } $power{$unit} += $power; } # ...
then you have to find units that you can convert to with matching powers. So, if you start with kg/cm/sec [ which becomes (kg=>1,cm=>-1,sec=>-1) ] and are asked to return lb/ft/hr (lb=>1,ft=>-1,hr=>-1), then you have to convert from kg to lb, then convert cm to either ft or hr (there will be no cm-to-hr path so you'll do cm-to-ft), then convert the left-overs, sec-to-hr. And you're done.

(Updated and tested.)

        - tye

In reply to (tye)Re3: The Definitive Unit Conversion Script by tye
in thread The Definitive Unit Conversion Script by Aristotle

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