In addition to haukex's comments here, I would say that the
    @required = keys %{{ map { $_ => 1 } @required }};
and
    @notthere = keys %{{ map { $_ => 1 } @notthere }};
statements are unnecessary. All they do is rearrange the order of elements in the respective arrays in a more-or-less random way, and this rearrangement has no useful effect.

c:\@Work\Perl>perl -wMstrict -le
"my @allwords = qw(this is a list of words that is required for tests)
+;
 my @required = qw(this is a list of words that is required);
 ;;
 my %hash = map { $_ => 1 } @allwords;
 ;;
 print 'do stuff'
   if @required == grep { defined $_ } @hash{@required};
 ;;
 my @notthere = qw(this list is not there in allwords);
 ;;
 print 'do not do stuff'
   unless @notthere == grep { defined $_ } @hash{@notthere};
"
do stuff
do not do stuff
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.