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/CCGG          # Match starting at DNA sequence CCGG
  (          
...
  )          
  AATT         # and ending at AATT
/x;

/CCGG   
  (          
...
   )         
  AATT  # and ending at AATT
/x;

/CCGG   
  (          
...
  )         # 
  AATT  # 
/x;