D-Link DVX-7090 User Manual page 66

X*+
X++
X{n}+
X{n,}+
X{n,m}+
XY
X|Y
DVX-7090 VoIP Router
X, zero or more times
X, one or more times
X, exactly n times
X, at least n times
X, at least n but not more than m times
Logical operators
X followed by Y
Either X or Y
Configuration How-to's
page 66 of 83