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  DB<136> @list= ("a".."c","DBIC","A".."C","DANCER","a".."c")
 => ("a", "b", "c", "DBIC", "A", "B", "C", "DANCER", "a", "b", "c")
...
 
  DB<140> grep { /DBIC/.. /DANCER/ and ! //  } @list 
 => ()