Firstly, you can read entire an entire transaction by setting the input record separator ($/, see perlvar). Second, you can use a regular expression with alternation to see if a transaction contains any of the numbers in one fell swoop.

use strict;
use warnings;

open my $numberFH, q{<}, \ <<EOD or die qq{open: $!\n};
123456789
567898760
154216722
763498126
EOD
chomp( my @numbers = <$numberFH> );
close $numberFH or die qq{close: $!\n};

my $rxFindTrans = do{
   local $" = q{|};
   qr{(@numbers)};
   };

open my $transFH, q{<}, \ <<EOD or die qq{open: $!\n};
some rubbish
lines
<BEGIN Transaction>
blurfl 154876543
<END Transaction>
more rubbish
<BEGIN Transaction>
the one we want 154216722
with more stuff
<END Transaction>
<BEGIN Transaction>
blargh 54211548
<END Transaction>
EOD

{
    local $/ = qq{<END Transaction>\n};
    while( <$transFH> )
    {
        s{.*(?=<BEGIN Transaction>)}{}s;
        next unless m{$rxFindTrans};
        print qq{Found $1 in:\n$_};
        print qq{==================\n};
    }
}

close $transFH or die qq{close: $!\n};

[download]

The output.

Found 154216722 in:
<BEGIN Transaction>
the one we want 154216722
with more stuff
<END Transaction>
==================

[download]

I hope this is helpful.

Cheers,

JohnGG

In reply to Re: Match a list of numbers from a list of files by johngg
in thread Match a list of numbers from a list of files by shawshankred

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