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Ch 10.1.2 (Best investment (can (find, replace, extract), Requirements…

- - - - ex
        
        phone numbers
        
        any text with a predictable format
  - - - \d
        
        any digit will do
      - \D
        
        any character except digtis
      - \w
        
        an
        
        any alphanumeric character
      - .
        
        means anything will do
      - ?
        
        not necessary for a match
      - \s
        
        whitesopace