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

##</code><code>##

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