$digit
Copy by position RHS operator
The LHS wildcard operators ($*, $+, $-, and $@) and the LHS class-matching
operators ($= and
$˜) can have
their matched values copied to the RHS by the
$digit
positional operator. Consider, for example, the
following rule:
R $+ < @ $- . $* > $: $1
Here, there are three wildcard operators in the LHS.
The first (the $+) corresponds to the $1 on the RHS. The
object of this rule is to match a focused address
and rewrite it as the username. For example,
gw@wash.dc.gov will be rewritten to
be gw.
The $digit
operator can be used only on the RHS of rules. See
Copy by Position: $digit on
page 661 for a full description of this $digit
operator.
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