Cisco TelePresence Administrator's Guide

Regular expressions
Regular expressions can be used in conjunction with a number of VCS features such as alias
transformations, zone transformations, CPL policy and ENUM. The VCS uses POSIX format regular
expression syntax. The table below provides a list of commonly used special characters in regular
expression syntax. This is only a subset of the full range of expressions available. For a detailed description
of regular expression syntax see the publication Regular Expression Pocket Reference.
Character Description Example
. Matches any single character.
\d Matches any decimal digit, i.e. 0-9.
* Matches 0 or more repetitions of the
previous character or expression.
.* matches against any sequence of characters
+ Matches 1 or more repetitions of the
previous character or expression.
? Matches 0 or 1 repetitions of the previous
character or expression.
9?123 matches against 9123 and 123
{n} Matches n repetitions of the previous
character or expression
\d{3} matches 3 digits
{n,m} Matches n to m repetitions of the previous
character or expression
\d{3,5} matches 3, 4 or 5 digits
[...] Matches a set of specified characters.
Each character in the set can be specified
individually, or a range can be specified by
giving the first character in the range
followed by the - character and then the
last character in the range.
You cannot use special characters within
the [] - they will be taken literally.
[a-z] matches any alphabetical character
[0-9#*] matches against any single E.164 character
- the E.164 character set is made up of the digits 0-9
plus the hash key (#) and the asterisk key (*)
[^...] Matches anything except the set of
specified characters. Each character in the
set can be specified individually, or a
range can be specified by giving the first
character in the range followed by the -
character and then the last character in the
range.
You cannot use special characters within
the [] - they will be taken literally.
[^a-z] matches any non-alphabetical character
[^0-9#*] matches anything other than the digits 0-9,
the hash key (#) and the asterisk key (*)
(...) Groups a set of matching characters
together. Groups can then be referenced in
order using the characters \1, \2, etc. as part
of a replace string.
A regular expression can be constructed to transform a
URI containing a user’s full name to a URI based on
their initials. The regular expression (.).*_(.).*
(@example.com) would match against the user john_
smith@example.com and with a replace string of
\1\2\3 would transform it to js@example.com
| Matches against one expression or an
alternate expression.
.*@example.(net|com) matches against any URI for
the domain example.com or the domain example.net
Cisco VCS Administrator Guide (X8.1.1) Page 400 of 507
Reference material
Regular expressions

Cisco TelePresence Specifications

General

Brand	Cisco
Model	TelePresence
Category	Server
Language	English