Trailing whitespace can be a bit tricky. Maybe something like:
c:\@Work\Perl\monks>perl -wMstrict -le
"for my $n (qw(
0.12345 -0.12345 123456.12 -123456.12 123456.12345 -123456.12345
)) {
my ($left, $right) = (7, 5);
my $s = sprintf qq{%${left}s.%-${right}s}, split m{[.]}xms, $n, 2;
print qq{'$s'};
}
"
' 0.12345'
' -0.12345'
' 123456.12 '
'-123456.12 '
' 123456.12345'
'-123456.12345'
Give a man a fish: <%-{-{-{-<
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