If you only want to get rid of the leading zero on the day this would work:

s!/0?(\d+)/!/$1/!
[download]

If you want to get rid of the leading zeros on both the month and the day this would work:

s!0?(\d+)/0?(\d+)!$1/$2!
[download]

use strict;
for ('12/09/2003', '12/10/2003', '01/01/2004') {
    my $date = $_;
    print "Before: $date\n";
    $date =~ s!/0?(\d+)/!/$1/!;
    print "Leading zero off of day: $date\n";
    $date = $_;
    $date =~ s!0?(\d+)/0?(\d+)!$1/$2!;
    print "Leading zero off of month and day: $date\n\n";

}
__END__

Before: 12/09/2003
Leading zero off of day: 12/9/2003
Leading zero off of month and day: 12/9/2003

Before: 12/10/2003
Leading zero off of day: 12/10/2003
Leading zero off of month and day: 12/10/2003

Before: 01/01/2004
Leading zero off of day: 01/1/2004
Leading zero off of month and day: 1/1/2004
[download]

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