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  DB<113> split ' ', 'abc  def'
 => ("abc", "def")
...

  DB<117> split $del, 'abc  def'
 => ("abc", "def")

               As a special case, specifying a PATTERN of space (' ') 
+will
               split on white space just as "split" with no arguments 
+does.
...
               "/\s+/" is like a "split(' ')" except that any leading
               whitespace produces a null first field.  A "split" with
+ no
               arguments really does a "split(' ', $_)" internally.