I am learning regular expression in sed,Please help me understand the use curly bracket in sed, Post: 302904539

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algorithm::checkdigits::m10_006

CheckDigits::M10_006(3pm)				User Contributed Perl Documentation				 CheckDigits::M10_006(3pm)

NAME

       CheckDigits::M10_006 - compute check digits for Rentenversicherung (DE)

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $rv = CheckDigits('rentenversicherung');

	 if ($rv->is_valid('65180539W001')) {
	       # do something
	 }

	 $cn = $rv->complete('65180539W00');
	 # $cn = '65180539W001'

	 $cd = $rv->checkdigit('65180539W001');
	 # $cd = '1'

	 $bn = $rv->basenumber('65180539W001');
	 # $bn = '65180539W00'

DESCRIPTION

   ALGORITHM
       1.  The letter is replaced with a two-figure number appropriate to the position of the letter in the german alphabet.

       2.  Beginning left all numbers are weighted with 2,1,2,5,7,1,2,1,2,1,2,1.

       3.  The the total of the digits of all products is computed.

       4.  The check digit is sum from 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::M10_006(3pm)