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  1. or download this
         if ($entry =~ /^([a-zA-Z0-9\@_\.]*)$/) {
  2. or download this
        if ($entry =~ /^([a-zA-Z0-9_\.\-\!\%\#]+\@[a-zA-Z0-9_\.]+)$/) {
  3. or download this
     qw [
      abc@123.it
      a@b
...
      user_144@z.com
      webmaster@estherdyson.museum
 ];