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 6.1 Constants, Variables and Conversions
 ========================================
 
 Expressions are built up from values and the operations performed upon
 them. This minor node describes the elementary objects which provide
 the values used in expressions.
 

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* Constants                   String, numeric and regexp constants.
* Using Constant Regexps      When and how to use a regexp constant.
* Variables                   Variables give names to values for later use.
* Conversion                  The conversion of strings to numbers and vice
                                 versa.
 

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