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$re[0] = qr (.*(?!system))i;
$re[1] = qr (system)i;
...
    }
  }
}

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Regex: (?-xism:.*(?!system))    Value: oneitem
oneitem matches (?-xism:.*(?!system))
...

Regex: (?-xism:system)  Value: anothersystem
anothersystem matches (?-xism:system)