The 16 line script below will take an arbitrary amount of data and run an arbitrary number of match criteria against it, only cycling over the data once. It uses a DATA section, but just replace the second argument to adTie() if the data and patterns are stored in files.

The script outputs: 

  record #2 contains pattern #1
  record #3 contains pattern #2
  record #4 contains pattern #1
  record #4 contains pattern #2

#!perl -w
use strict;
use AnyData;
my($data,$patterns) = split /\n~\n/, join'',<DATA>;
my $dataHash    = adTie( 'CSV',[$data],'r',{cols=>'id,d1,d2,d3,d4,d5'}
+ );
my $patternHash = adTie( 'CSV',[$patterns],'r',{cols=>'id,criteria'} )
+;
while (my $row = each %$dataHash) {
    while (my $pattern = each %$patternHash) {
        my $criteria = $pattern->{criteria};
        for my $datum(qw(d1 d2 d3 d4 d5)) {
            $criteria =~ s/$datum/$row->{$datum}/g;
        }
        next unless eval $criteria;
        printf "record #%s contains pattern #%s\n",$row->{id},$pattern
+->{id};
    }
}
__DATA__
1,9,9,9,9,9
2,3,5,9,9,9
3,9,9,7,8,4
4,3,5,7,8,4
~
1,d1==3 and d2==5
2,d3==7 and d4==8 and d5==4

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In reply to Re: Best way to find patterns in csv file? by jZed
in thread Best way to find patterns in csv file? by punch_card_don

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