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IIRC , the original patterns are pulled from a database, but in the above case pulling the patterns from a file each time could perhaps be avoided by reading them all in at once:
open my $p, "< ". shift @ARGV or die "could not open pattern file: $!"; my @patterns = <$p>; chomp @patterns; for my $filename (@ARGV) { open my $f, "< $filename" or die "could not open $filename: $!"; my @lines = <$f>; for my $pattern (@patterns) { printf "%s has %d matches for pattern /%s/\n", $filename, scalar(grep /$pattern/, @lines), $pattern; } }

Going back to the original pulling patterns from a db gives us:

# get column 0 from all result rows simultaneously.... my $results = $sth->fetchall_arrayref([0]); # error check here? # results are ref to array of hashes, so convert to array # we could avoid this and use "results" directly my @patterns = map { $_->[0] } @$results; for my $filename (@ARGV) { open my $f, "< $filename" or die "could not open $filename: $!"; my @lines = <$f>; for my $pattern (@patterns) { printf "%s has %d matches for pattern /%s/\n", $filename, scalar(grep /$pattern/, @lines), $pattern; } }

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In reply to Re^2: Searching pattern in 400 files and getting count out of each file by space_monk
in thread Searching pattern in 400 files and getting count out of each file by Rita_G

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