Algorithm::CheckDigits::M11_011 (3pm)

  use Algorithm::CheckDigits;

  $ustid = CheckDigits('ustid_nl');

  if ($ustid->is_valid('123456782')) {
        # do something
  }
  if ($ustid->is_valid('123456782B04')) {
        # do something
  }

  $cn = $ustid->complete('12345678');
  # $cn = '123456782'
  $cn = $ustid->complete('12345678.B04');
  # $cn = '123456782B04'

  $cd = $ustid->checkdigit('123456782');
  # $cd = '2'
  $cd = $ustid->checkdigit('123456782B04');
  # $cd = '2'

  $bn = $ustid->basenumber('123456782');
  # $bn = '12345678';
  $bn = $ustid->basenumber('123456782B04');
  # $bn = '12345678.B04';

This \s-1VATRN\s0 has 12 \*(L"digits\*(R", the third last must be a B, the fourth last is the checkdigit. I don't know anything about the meaning of the last two digits.

You may use the whole \s-1VATRN\s0 or only the first eight digits to compute the checkdigit with this module.

\s-1ALGORITHM\s0

1.

Beginning right with the digit before the checkdigit all digits are weighted with their position. I.e. the digit before the checkdigit is multiplied with 2, the next with 3 and so on.

2.

The weighted digits are added.

3.

The sum from step 2 is taken modulo 11.

4.

If the sum from step 3 is 10, the number is discarded.

\s-1METHODS\s0

is_valid($number)

Returns true only if $number consists solely of numbers and hyphens and the two digits in the middle are valid check digits according to the algorithm given above. Returns false otherwise,

complete($number)

The check digit for $number is computed and inserted into the middle of $number. Returns the complete number with check digit or '' if $number does not consist solely of digits, hyphens and spaces.

basenumber($number)

Returns the basenumber of $number if $number has a valid check digit. Return '' otherwise.

checkdigit($number)

Returns the check digits of $number if $number has valid check digits. Return '' otherwise.

\s-1EXPORT\s0

None by default.

perl, CheckDigits, www.pruefziffernberechnung.de,

Mathias Weidner, <[email protected]>

Copyright 2004,2005 by Mathias Weidner

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.