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my($grant,$db,$schema,$user,$scope) = $results[0] =~ m/.*GRANT\s(.+)\s
+ON\s(.+)\.(.+)\sTO\s(\S+)\@(\S+)/ix;
if (defined $user && length $user > 0) {
...
  }
  ...
}

if (my ($grant, $db, $schema, $user, $scope) = $results[0] =~ /.*GRANT
+\s(.+)\sON\s(.+)\.(.+)\sTO\s(\S+)\@(\S+)/i)
{
...
    $scope  =~ tr/'`//d;
    ...
}