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 Section 18.7.1 in
this chapter for a full description of this
$digit operator.
