How about avoiding sprintf altogether? 
my $string = 'TEST';
$string .= '0000';

[download]
Update: If you have a variable length string, then use 
$string .= '0' x ($fixed_length - length $string);

[download]
to pad it to the desired $fixed_length.

-Mark

In reply to Re: sprintf question by kvale
in thread sprintf to zero-pad on the right by Anonymous Monk

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