#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
use autodie;

use Text::CSV;


sub build_regex {
    my ($filename) = @_;
    my @regexes;
    my $csv = 'Text::CSV'->new;
    open my $fh, '<', $filename;
    while (my $row = $csv->getline($fh)) {
        push @regexes, join '|', map quotemeta, @$row;
    }
    return join '|', @regexes
}


sub find_matches {
    my ($filename, $regex) = @_;
    my $csv = 'Text::CSV'->new;
    open my $fh, '<', $filename;
    while (my $row = $csv->getline($fh)) {
        /$regex/ and say for @$row;
    }
}


my ($f1, $f2) = qw( 1.csv 2.csv );

find_matches($f1, build_regex($f2));