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

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.

#|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)})|(?!))/; } ;


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


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


Please consult the manual of the Regexp::Common manpage 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 the Regexp::Common manpage):

captures the entire SSN.

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

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

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


 $Log:,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 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


the Regexp::Common manpage for a general description of how to use this interface.


Damian Conway and Abigail.


This package is maintained by Abigail (


Bound to be plenty.

For a start, there are many common regexes missing. Send them in to


          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

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