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  1. or download this
    if ($file =~ /^\d{8}(?:_\d+)*\.ilf$/i ||
    $file =~ /^\d{8}(?:\s\d+)*\.sht$/i
) {
   ...
}
  2. or download this
          vvvvvvvvv  vvv vvv   vvvv  common
     /^\d{8}(?:_ \d+)*\.ilf$/ix
     /^\d{8}(?:\s\d+)*\.sht$/ix
               ^^       ^^^      not common
  3. or download this
                (?:_ \d+)*\.ilf
     /^\d{8}               $/ix
            (?:\s\d+)*\.sht
  4. or download this
    if ($file =~ /^\d{8}(?:(?:_\d+)*\.ilf|(?:\s\d+)*\.sht)$/i) {
   ...
}