try:

my $var = 'LR20SR37PD30LR23CR23BT01H';
$var .= ' ' x 40 - length($var);

[download]
or 
my $var = 'LR20SR37PD30LR23CR23BT01H';
$var = substr($var . ' ' x 40, 0, 40);

[download]
or 
my $var = 'LR20SR37PD30LR23CR23BT01H';
$var = sprintf '%-40s', $var;

[download]

In reply to Re: Padding with \s by busunsl
in thread Padding with \s by Anonymous Monk

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