Regular Expression - 3Com MSR 50 Series Configuration Manual

1 After receiving a voice call (the called number), the voice gateway on the called
2 The voice gateway on the called side selects a proper voice entity based on the

Regular Expression

Figure 666 Dial plan process on the called side
Local voice subscriber line
Number
substitution
Select a
Voice entity
voice entity
Number
substitution
Global
Global
Receive a number (called number)
side performs calling/called number substitution globally.
voice entity selection priority rules. (Number substitution may also be involved
during the voice entity selection.) If the called party is a local voice subscriber, the
gateway directly connects the subscriber line. If the called party is a PSTN
subscriber, the gateway initiates a call and sends the calling/called number to the
PSTN. The PBX in the PSTN connects the call.
You will frequently use some regular expressions when configuring number
substitution rules. Regular expressions are a powerful and flexible tool for pattern
matching and substitution. They are not restricted to a language or system and
have been widely accepted.
When using a regular expression, you need to construct a matching pattern
according to certain rules, and then compare the matching pattern with the target
object. The simplest regular expressions do not contain any meta-character. For
example, you can specify a regular expression "hello", which only matches the
string "hello".
To help you to construct matching patterns flexibly, regular expressions contain
some special characters, called meta-characters, which define the way other
characters appear in the target object.
Table 80 Meta-characters
Meta-character Meaning
0-9 Digits 0 through 9
# and * Each indicates a valid digit
. Wildcard, which can match any valid digit. For example, 555.... can
match any number beginning with 555 and ending in four additional
characters.
Processing sequence
PSTN
on called side
Table 80
Dial Plan Overview
describes these meta-characters.
2291