or, if you don't know what the words are ahead of time:

#!/usr/bin/perl -w
use strict;

my @approved = qw( foo bar);

@approved = map { $_ = quotemeta $_; ### very important
                  qr/$_/is;  ## available in perl 6, not really needed
                } @approved;

print "The approved list\n", join "\n", @approved;

my $merex = join ' && ', map "/$_/", @approved;

print "merex \n$merex\n\n";
if(@ARGV)
{
    print "ARGV\n";

    while(<DATA>)
    {
        print if eval $merex;
    }
}
else
{
    while(<DATA>)
    {
        my $toprint = 0;
        for my $r(@approved)
        {
            $toprint++ if m/$r/;
        }
        print if $toprint == scalar @approved;
    }
}

__DATA__
foo bar
bar foo
foo
bar
baz
barbazfoo
foofoobar
[download]

which yields:

F:\dev>perl f.pl 3
The approved list
(?si-xm:foo)
(?si-xm:bar)merex
/(?si-xm:foo)/ && /(?si-xm:bar)/

ARGV
foo bar
bar foo
barbazfoo
foofoobar

F:\dev>perl f.pl
The approved list
(?si-xm:foo)
(?si-xm:bar)merex
/(?si-xm:foo)/ && /(?si-xm:bar)/

foo bar
bar foo
barbazfoo
foofoobar

F:\dev>

---

Chore List: 1 - buy more coffee 2 - re-impress upon davorg the importance of rule 1

 
___crazyinsomniac_______________________________________
Disclaimer: Don't blame. It came from inside the void
perl -e "$q=$_;map({chr unpack qq;H*;,$_}split(q;;,q*H*));print;$q/$q;"