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Regular expression reference
Overview
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 opposite 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
Mastering Regular Expressions
[9].
For an example of regular expression
usage, see the
CPL examples
section.
Overview and
System
Introduction
status
configuration
D14049.07
March 2010
Character
Description
.
Matches any single character.
*
Matches 0 or more repetitions of the previous match.
+
Matches 1 or more repetitions of the previous match.
\
Escapes a regular expression special character.
\d
Matches any decimal digit, i.e. 0-9.
[...]
Matches a set of 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 can not use special characters within the [] - they
will be taken literally.
(...)
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.
|
Matches against one expression or an alternate
expression.
^
Signifies the start of a line.
When used immediately after an opening brace, negates
the character set inside the brace.
$
Signifies the end of a line.
(?!...)
Negative lookahead. Defines a subexpression that must
not be present in order for there to be a match.
VCS
Zones and
Clustering and
configuration
neighbors
peers
Common regular expressions
Example
.* will match against any sequence of characters.
[a-z] will match against any lower case alphabetical character.
[a-zA-Z] will match against any alphabetical character.
[0-9#*] will match 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
(*).
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.
.*@example.(net|com) will match against any URI for the domain
example.com or the domain example.net.
[^abc] matches any single character that is NOT one of a, b or c.
^\d\d\d$ will match any string that is exactly 3 digits long.
(?!.*@tandberg.net$).* will match any string that does not end with @
tandberg.net.
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