Regexp::Common::SEN(3p)

sub par11 {
    my $string = shift;
    my $sum = 0;
    for my $i (0 .. length ($string) - 1) {
        my $c = substr ($string, $i, 1);
        $sum += $c * (length ($string) - $i)
    }
    !($sum % 11) }

It's not clear whether this is the right checksum.

# http://www.google.nl/search?q=cache:8m1zKNYrEO0J:www.enschede.nl/nieuw/projecten/aanbesteding/integratie/pve%2520Bijlage%25207.5.doc+Sofi+nummer+formaat&hl=en&start=56&lr=lang_en|lang_nl&ie=UTF-8 pattern name => [qw /SEN Netherlands SoFi/],
        create => sub {
            # 9 digits (d1 d2 d3 d4 d5 d6 d7 d8 d9)
            # 9*d1 + 8*d2 + 7*d3 + 6*d4 + 5*d5 + 4*d6 + 3*d7 + 2*d8 + 1*d9
            # == 0 mod 11.
            qr /([0-9]{9})(?(?{par11 ($^N)})|(?!))/;
        }
        ;

NAME
Regexp::Common::SEN -- provide regexes for Social-Economical Numbers.

SYNOPSIS
 use Regexp::Common qw /SEN/;

 while (<>) {
     /^$RE{SEN}{USA}{SSN}$/    and  print "Social Security Number\n";
 }

DESCRIPTION
Please consult the manual of Regexp::Common for a general description of the works of this interface.

Do not use this module directly, but load it via Regexp::Common. Returns a pattern that matches an American Social Security Number (SSN). SSNs consist of three groups of numbers, separated by a hypen ("-"). This pattern only checks for a valid structure, that is, it validates whether a number is valid SSN, was a valid SSN, or maybe a valid SSN in the future. There are almost a billion possible SSNs, and about 400 million are in use, or have been in use.

If "-sep=P" is specified, the pattern P is used as the separator between the groups of numbers.

Under "-keep" (see Regexp::Common):

$1  captures the entire SSN.

$2  captures the first group of digits (the area number).

$3  captures the second group of digits (the group number).

$4  captures the third group of digits (the serial number).

HISTORY
 $Log: SEN.pm,v $
 Revision 2.102  2005/01/02 01:17:48  abigail
 - Removed 'use Carp', as we aren't using it.
 - Outcommented unused 'par11' function. Ought to be in _support.pm anyway.

 Revision 2.101  2004/06/09 21:52:14  abigail
 Force 2.101 version

 Revision 2.1  2004/06/09 21:50:14  abigail
 Initial checkin

SEE ALSO
Regexp::Common for a general description of how to use this interface.

AUTHORS
Damian Conway and Abigail.

MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.nl).

BUGS AND IRRITATIONS
Bound to be plenty.

For a start, there are many common regexes missing. Send them in to regexp-common@abigail.nl.

COPYRIGHT
          Copyright (c) 2001 - 2003, Damian Conway and Abigail.
        All Rights Reserved. This module is free software. It may
        be used, redistributed and/or modified under the terms of
                        the Perl Artistic License
            (see http://www.perl.com/perl/misc/Artistic.html)