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  1. or download this
    $ perl -MO=Deparse -e'if (not $label.$inst =~ /\blea\b/i) {}'
unless ($label . $inst =~ /\blea\b/i) {
    ();
}
-e syntax OK
  2. or download this
    $ perl -MO=Deparse -e'if (not ($label.$inst) =~ /\blea\b/i) {}'
if (!($label . $inst) =~ /\blea\b/i) {
    ();
}
-e syntax OK