Dear Monks,

Please could people point out the differences between the following: 
#! perl -w script

use strict;
use warnings;


my $Method; 
my $number_of_years;

$Method = 'DDD_t_s_2222_2222_01_2222';


if $Method =~ /DDD_____%/ {

     $number_of_years = ($yearto-$yearfrom)+1; 

}
elsif ($Method =~ /DDD_t(.|\d){13}(\d{2})/) {
        

  if ($Method =~ /DDD_t(.|\d){14}(\d{1})/) {

    $number_of_years = $2;

  }
  elsif ($Method =~ /DDD_t(.|\d){13}(\d{2})/) {

    $number_of_years = $2;

  }
}

[download]
and 

DECLARE @Method AS NVARCHAR
SET  @Method = 'DDD_t_s_2222_2222_01_2222'

DECLARE @number_of_years AS NVARCHAR


if @Method LIKE 'DDD_____%' begin

    SET @number_of_years = (@yearto-@yearfrom)+1 

end
else if @Method LIKE 'DDD_t%' begin

    if (SELECT SUBSTRING(@Method, 21, 1)) = 0 begin
        
        SET @number_of_years = (SELECT SUBSTRING(@Method, 22, 1))     
+ end
    else begin
        
        SET @number_of_years = (SELECT SUBSTRING(@Method, 21, 2))
    end
end

[download]
As at least one of them does not behave as expected.

In reply to SQL and Perl comparison by Win

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