print parse_equation("Div Div Con 18 Con 2 Con 3"); # just a sexeger sub parse_equation { my $r = reverse $_[0]; $r =~ s!(\d+(?:\.\d+)?) noC (\d+(?:\.\d+)?) noC viD! reverse($2)/reverse($1) . ' noC' !e while $r =~ /viD/; return scalar reverse $r; }