NAME

Regexp::Common::support -- Support functions for Regexp::Common.

SYNOPSIS 

    use Regexp::Common::_support qw /luhn/;

    luhn ($number)    # Returns true/false.

DESCRIPTION

This module contains some subroutines to be used by other Regexp::Common modules. It's not intended to be used directly. Subroutines from the module may disappear without any notice, or their meaning or interface may change without notice.

luhn
This subroutine returns true if its argument passes the luhn checksum test.

SEE ALSO

http://www.webopedia.com/TERM/L/Luhn_formula.html.

HISTORY 

 $Log: _support.pm,v $
 Revision 2.103  2008/05/23 21:30:09  abigail
 Changed email address

 Revision 2.102  2008/05/23 21:28:01  abigail
 Changed license

 Revision 2.101  2004/12/18 11:28:25  abigail
 POD nit (Mike Castle)

 Revision 2.100  2004/07/01 14:47:00  abigail
 Force version

 Revision 2.1  2004/07/01 14:46:35  abigail
 Initial checkin

AUTHOR

Abigail (regexp-common@abigail.be).

BUGS AND IRRITATIONS

Bound to be plenty.

COPYRIGHT

This software is Copyright (c) 2001 - 2008, Damian Conway and Abigail.

This module is free software, and maybe used under any of the following licenses: 

 1) The Perl Artistic License.     See the file COPYRIGHT.AL.
 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
 3) The BSD Licence.               See the file COPYRIGHT.BSD.
 4) The MIT Licence.               See the file COPYRIGHT.MIT.