10-02-2001
Cool! This would work for 16 digit credit cards with dashes; but what if users don't put in dashes or if the 'card' number is 13, or 19 digits (vendor id number, ledger number, etc).
Since I am new to sed, the question would be, if I don't have dashes and I need to check these cases, would this be correct to check, for instance, a 16 digit number?
sed 's/[0-9]\{16\}/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/'
Thanx. As always, I am learning so much from this website!
Giannicello
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LEARN ABOUT DEBIAN
algorithm::checkdigits::mxx_004
CheckDigits::MXX_004(3pm) User Contributed Perl Documentation CheckDigits::MXX_004(3pm)
NAME
CheckDigits::MXX_004 - compute check digits for VAT RN (AT)
SYNOPSIS
use Algorithm::CheckDigits;
$vat = CheckDigits('ustid_at');
if ($vat->is_valid('U13585627')) {
# do something
}
$cn = $vat->complete('U1358562');
# $cn = 'U13585627'
$cd = $vat->checkdigit('U13585627');
# $cd = '7'
$bn = $vat->basenumber('U13585627');
# $bn = 'U1358562'
DESCRIPTION
ALGORITHM
1. Beginning right all numbers before the check digit are weighted alternatively 1 and 2.
2. The total of the digits of all products is computed and then subtracted from 96.
3. The check digit is the sum of step 3 taken modulo 10.
METHODS
is_valid($number)
Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given
above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and concatenated to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.
basenumber($number)
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
checkdigit($number)
Returns the checkdigit of $number if $number has a valid check digit.
Return '' otherwise.
EXPORT
None by default.
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.
perl v5.10.0 2008-05-17 CheckDigits::MXX_004(3pm)