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10.1.2 RegEx (What if pattern is more restricted? (^ (when not in square…

- - - - ex: need 303 or 720
        
        {37]\d\d or [73]\d\d
        
        303 | 720
      - ex: Kai and Lai
        
        [KL]\D\D
        
        [KL][a-z][a-z]
- - - - declares that the RegEx pattern preceding it can be matched 0-infinite amount of times
      - allows for RegEx pattern to be skipped entirely if it doesn't exist ina string (0 matches) or be matched many times
        
        ex: \w*: matches a string of letter characters a-z of any length
    - - specifies that a pattern must occur at least once
    - - specifies exactly how may times a pattern can appear with the possibility of including lower and upper bounds
- - - - \d: any digit will do
        
        \d\d\d: all combinations of 3 digits
      - \D: any character except digits
        
        \D\D\D\D\D\D\D: finds a 7 character scrabble word
      - \w: accepts any alphanumeric character (digits 0-9 and letters a-Z)
        
        \w\w\w\w\w\w\w: will find aband1r
        
        \W\W\W\W: &*%$
      - \s: whitespace
      - \S: anything but whitespace
    - - will return any and all characters
    - - character directly preceding it is not necessary for a match
        
        ex: "color" or "colour" - colou?r