DB<103> $_="aXaXa"
 => "aXaXa"

  DB<104> $x=split /X/
 => 3

  DB<105> split /X/
 => ("a", "a", "a")


##</code><code>##

  DB<106> $_="XaX"
 => "XaX"

  DB<107> $x=split /X/
 => 2

  DB<108> split /X/
 => ("", "a")