Perl Compatible Regular Expressions (PCRE) enables you to specify i18n compatible (UTF-8) regular expressions while defining monitors that support regular expressions. These monitors monitor log files, processes, process groups, Windows services and Windows events. You can also use this option to create more complex regular expressions.
You can choose between two regular expression libraries:
PCRE is not 100 percent compatible with the standard regular expression library due to delimiters and a wider range of special characters.
To enable PCRE library, you can manually edit the configuration file in SystemEDGE legacy mode by adding the following line:
use_pcre
If you edit the configuration file in managed mode, the configuration is wiped out the next time policy is deployed.
You can enable PCRE library in managed mode using CA Virtual Assurance Policy Configuration user interface. In the user interface, use the “Use Perl Compatible Regular Expressions” option in “Control Settings” tab. Specifying the “<JS>” pattern modifier activates JavaScript compatibility mode for this expression.
PCRE covers POSIX basic and POSIX extended regular expressions and a subset of regular expression functionality provided by Perl. For more information about PCRE, see http://www.pcre.org.
Supported formats for input regular expressions:
/regular expression/switch
regular expression
Note: The suggested way to use PCRE is specifying regular expressions with delimiters and optional switches (/regex/i).
List of supported switches
PCRE_CASELESS (Perl compatible /i): Matches both uppercase and lowercase letters.
PCRE_MULTILINE (Perl compatible /m): Matches across multiple lines.
PCRE_DOTALL (Perl compatible /s): A dot metacharacter in the pattern matches a character of any value, including one that indicates a newline.
PCRE_EXTENDED (Perl compatible /x): Whitespace data characters in the pattern are ignored except when escaped or inside a character class.
PCRE_DOLLAR_ENDONLY: $ matches only at the end.
PCRE_UNGREEDY: The greediness of the repetition quantifiers is inverted, that is, by default they are not greedy, but if followed by a question mark they are.
PCRE_JAVASCRIPT_COMPAT: Specifies JavaScript compatibility.
List of supported delimiters
In addition to the default regular expression delimiter (/), SystemEDGE supports alternate delimiters to simplify expressions that specify forward slashes in UNIX and Linux paths. The alternate delimiters are (#), (|), and (:).
For example, the following regular expressions are equivalent:
/\/dir1\/dir2\/dir3\/filename/i #/dir1/dir2/dir/filename3#i |/dir1/dir2/dir3/filename|i :/dir1/dir2/dir3/filename:i
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