Another approach that solves the overlap problem: 
++$seen{lc($_)} for split /\s+/, $zipFile;
if ($seen{this} && $seen{$that}) {
    ....
}

[download]
gives the same results as 
if ($zipFile =~ /\bthis\b/i && $zipFile =~ /\bthat\b/i) {
    ....
}

[download]

In reply to Re: pattern matching words in any order by ikegami
in thread pattern matching words in any order by daveatmcafee

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