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Full Discussion: Check if a string exists in a file
Top Forums Shell Programming and Scripting Check if a string exists in a file Post 302950359 by Don Cragun on Thursday 23rd of July 2015 10:21:44 PM
Old 07-23-2015
Quote:
Originally Posted by Scrutinizer
Note: Even though this will work with the sample at hand, since it is only the last digits that need to be ignored, an anchor ($)should be used. Also, to ignore any kind of spaces and make it more robust, $1 should be used rather than $0, so instead of
Code:
gsub(/[[:digit:]]/,X,$0)

try:
Code:
sub(/[[:digit:]]+$/,X,$1)

I would have thought (with an example including HUNGARY1), that there could also be entries like NEW ZEALAND7. In which case, $0 would be better than $1.

The samples provided all had single decimal digit numbers, but looking back at the original problem statement: "The strings in someStrings.txt sometimes end with a number ." (not end with digit), you may be correct in interpreting it as non-negative decimal number). Of course, the intent could even be that any string that would be treated as a number when scanned by strtod() should be considered a number. Without a clearer definition of terms by kraljic, we're just guessing at what regular expression is needed.
 

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LEARN ABOUT DEBIAN

algorithm::checkdigits::m10_009

CheckDigits::M10_009(3pm)				User Contributed Perl Documentation				 CheckDigits::M10_009(3pm)

NAME

       CheckDigits::M10_009 - compute check digits for Betriebsnummer (DE)

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $betrnr = CheckDigits('betriebsnummer');

	 if ($betrnr->is_valid('73282932000074')) {
	       # do something
	 }

	 $cn = $betrnr->complete('7328293200007');
	 # $cn = '73282932000074'

	 $cd = $betrnr->checkdigit('73282932000074');
	 # $cd = '4'

	 $bn = $betrnr->basenumber('73282932000074');
	 # $bn = '7328293200007'

DESCRIPTION

   ALGORITHM
       1.  Beginning left all numbers are weighted alternatively 1 and 2.

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

       3.  The sum of step 3 ist taken modulo 10.

       4.  The check digit is the difference between 10 and the number from step 3 taken modulo 10.

	   HINT: The last digit of the 'Betriebsnummer' may be the check digit or the last digit of the sum of the constant 5 and the check digit.

   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.  www.dsi.cnrs.fr/bureau_qualite/admindonnees/documents/siren.pdf

perl v5.10.0							    2008-05-17						 CheckDigits::M10_009(3pm)
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