Hi Perl masters, I am trying to lookup the existence of a list of unions in a bunch of collective agreements. I was told my codes aren't efficient because they are going through an array one by one. I try to use these two lines

my ( $first_match ) = grep { $line =~ m/\Q$_\E/ } keys %InputData_Empl
+oyersHash;
print $search and last SEARCH if $first_match ne "";
[download]

(modified from https://www.perlmonks.org/?node_id=1183136) but they don't work. Thank you very much

Here's my working code:

read_in_data_union();
process_files ($FileFolder);

sub read_in_data_union
{
    open(my $fh, '<:crlf', $DataFile_Unions)
        or die "Could not open file '$DataFile_Unions' $!";

    chomp(@InputData_Unions = <$fh>);

}

sub process_files
{
    my $path = shift;

    opendir (DIR, $path)
        or die "Unable to open $path: $!";

    my @files = grep { /.pdf.txt/ } readdir (DIR);

    closedir (DIR);

    @files = map { $path . '/' . $_ } @files;

    foreach my $file (@files)
    {
        open (my $txtfile, $file) or die "error opening $file\n";
        print $FileHandle "$file";
        LookForUnion:
        {
            print $FileHandle "\t";
            while (my $line=<$txtfile>)
            {
                foreach (@InputData_Unions)
                {
                    if ($line =~ /\Q$_/i)
                    {
                        print $FileHandle "$_";
                        last LookForUnion;
                    }
                }
            }
        }
    }
}
[download]

My union.txt file sample:

Sarnia Employees' Bargaining Association
Sarnia Municipal Administrative Employees' Assn.
Sarnia Police Association
Sarnia Professional Fire Fighters'
[download]

and the collective agreements are just converted text files from PDFs Sample:

McMaster University

(The "Employer")

and

Service Employees International Union, Local 2 BGPWU ("SEIU")

Representing Hospitality Services Staff

________________________________________

COLLECTIVE AGREEMENT
[download]

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