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@lines = (
           q{23.40:hello:this:is:a:line},
...
@sorted = map { $_->[1] }
              sort { $a->[0] <=> $b->[0] }
                   map { [ (split(/:/,$_))[0], $_ ] }@lines;

@split = sort { $a->[0] <=> $b->[0] } map { [ split /:/ ] } @lines;