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Ruby Programming
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Performs an expression substitution, as with strings. By default, the substitution is performed each time a regular expression literal is evaluated. With the /o option, it is performed just the first time.

\0, \1, \2, ... \9, \&, \`, \', \+
Substitutes the value matched by the nth grouped subexpression, or by the entire match, pre- or postmatch, or the highest group.
Ruby Programming
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