with
.B digit
ranging from 1 to 9.
+The style qualifier
+allows an optional
+.BR modifier .
+At present, the only type allowed is
+.BR expand ,
+which causes substring substitution of submatches to take place
+even if
+.B dnstyle
+is not
+.BR regex .
.LP
The statement
.B dnattr=<attrname>
As this lookup can easily be spoofed, use of the
.B domain
statement is strongly discouraged. By default, reverse lookups are disabled.
+The optional
+.B domainstyle
+qualifier of the
+.B domain
+clause allows a
+.B modifier
+option; the only value currently supported is
+.BR expand ,
+which causes substring substitution of submatches to take place even if
+the
+.B domainstyle
+is not
+.BR regex ,
+much like the analogous usage in
+.B dn
+clause.
.LP
The statement
.B set=<pattern>