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Mail Administration Guide

Left-Hand Side of Address-Rewriting Rules

The left-hand side of rewriting rules contains a pattern. Normal words are matched directly. Dollar signs introduce "metasymbols," which match items other than simple words, like macros or classes. Table 3-11 shows the metasymbols.

Table 3-11 sendmail Left-Hand Side Metasymbols

Symbol 

Matches 

$*

Zero or more tokens 

$+

One or more tokens 

$-

Exactly one token 

$=x

Any string in class x

$~x

Any token not in class x

$x

Macro x

If any of the patterns match, it is assigned to the symbol $n for replacement on the right-hand side, where n is the index in the LHS. For example, the LHS rules can be applied to this input: 


$-:$+
 

JUPITER:eric

The rule will match, and the values passed to the RHS will be:

$1	JUPITER
$2	eric