extract an exact match  2011-07-15 2011-07-15
           extract from middle of string  2011-07-15 2011-07-15
      extract from middle of string (P2)  2011-07-15 2011-07-15
      extract from middle of string (P3)  2011-07-15 2011-07-15
              copyright example has date  Copyright 2011 Copyright 2011
          copyright example missing date  No copyright No copyright