use Regexp::Assemble;
my $patterns = "/path/to/file.txt";
my $list_regex = Regexp::Assemble->new(file => $patterns);
$list_regex->track( 1 );

open( FILE, "<", "$arg1") or die "$arg1: $!\n";
while (<FILE>) {
	if (/$list_regex/) {print "\n$arg1\n$list_regex->matched\n";}
	}
close(FILE);
}

##</code><code>##

my $patterns = "/path/to/file.txt";
my $arg1 = shift;

open( PATTERNS, "<", $patterns ) or die "$patterns: $!\n";
my @list_patterns = <PATTERNS>;
close PATTERNS;
chomp @list_patterns;

my $regexStr = "(" . join("|", @list_patterns) . ")";
	my $list_regex = qr{$regexStr}i;
    
    open( FILE, "<", "$arg1") or die "$arg1: $!\n";
    while (<FILE>) {
    	if (/$list_regex/) {print "\n$arg1\n$1\n";}
	    }
    close(FILE);


##</code><code>##

part1.*part2

##</code><code>##

fggffgfg
part1
hghggh
ghhggh
hggh


part2
ytyty