Regular Expression - HP FlexNetwork MSR Series Configuration Manual

On the called side
Figure 27
shows the dial plan operation process on the called side.
Figure 27 Flow chart for dial plan operation process on the called side
1. After receiving a voice call (the called number), the voice gateway on the called side performs
global calling/called number substitution.
2. The voice gateway on the called side selects proper voice entities based on the voice entity
selection priority rules. (Number substitution might 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 and called numbers to the PSTN. The PBX in the PSTN connects the call.

Regular expression

You will frequently use some regular expressions when you configure 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 are 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 metacharacter. For example, you can specify the regular expression
"hello", which matches only the string "hello".
To help you construct flexible matching patterns, regular expressions support some special
characters, called metacharacters, which define the way other characters appear in the target
Table 12
object.
Table 12 Metacharacters
Metacharacter
0-9
Pound sign (#) and
asterisk (*)
describes these metacharacters.
Meaning
Digits 0 through 9.
Each indicates a valid digit.
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