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 5.1 Constant Expressions
 ========================
 
 The simplest type of expression is the "constant", which always has the
 same value.  There are three types of constants: numeric, string, and
 regular expression.
 
    Each is used in the appropriate context when you need a data value
 that isn't going to change.  Numeric constants can have different
 forms, but are stored identically internally.
 

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* Scalar Constants            Numeric and string constants.
* Nondecimal-numbers          What are octal and hex numbers.
* Regexp Constants            Regular Expression constants.
 

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