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  1. or download this
    while ($data_in =~ /<container><a>(.+?)<\/a><b>(.+?)<\/b><\/container>
+(<\?query\?>)??/ig)  {
  {
...
  }
  # further processing
}
  2. or download this
    while ($data_in =~ /<container><a>(.+?)<\/a><b>(.+?)<\/b><\/container>
+(<\?query\?>)??/ig)  {
  if ( defined $3 ) {
...
    }
  # further processing
}
  3. or download this
    while ($data_in =~ /<container><a>(.+?)<\/a><b>(.+?)<\/b><\/container>
+(<\?query\?>)??/ig)  {
  $data_out = ( defined $3 ) ? "$2, $1$3 " : "$2, $1 ";
}