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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.

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