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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.
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